diff --git a/app/src/main/java/com/keylesspalace/tusky/AccountActivity.java b/app/src/main/java/com/keylesspalace/tusky/AccountActivity.java
index e7937bcf..653bf601 100644
--- a/app/src/main/java/com/keylesspalace/tusky/AccountActivity.java
+++ b/app/src/main/java/com/keylesspalace/tusky/AccountActivity.java
@@ -25,7 +25,6 @@ import android.support.design.widget.Snackbar;
 import android.support.design.widget.TabLayout;
 import android.support.v4.view.ViewPager;
 import android.support.v7.app.ActionBar;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.text.method.LinkMovementMethod;
 import android.util.TypedValue;
@@ -50,7 +49,7 @@ import org.json.JSONObject;
 import java.util.HashMap;
 import java.util.Map;
 
-public class AccountActivity extends AppCompatActivity {
+public class AccountActivity extends BaseActivity {
     private static final String TAG = "AccountActivity"; // logging tag
 
     private String domain;
diff --git a/app/src/main/java/com/keylesspalace/tusky/BaseActivity.java b/app/src/main/java/com/keylesspalace/tusky/BaseActivity.java
new file mode 100644
index 00000000..28e523a2
--- /dev/null
+++ b/app/src/main/java/com/keylesspalace/tusky/BaseActivity.java
@@ -0,0 +1,58 @@
+/* Copyright 2017 Andrew Dawson
+ *
+ * This file is part of Tusky.
+ *
+ * Tusky is free software: you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License as published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky. If not, see
+ * <http://www.gnu.org/licenses/>. */
+
+package com.keylesspalace.tusky;
+
+import android.graphics.Color;
+import android.graphics.PorterDuff;
+import android.graphics.drawable.Drawable;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.support.annotation.Nullable;
+import android.support.v7.app.AppCompatActivity;
+import android.util.TypedValue;
+import android.view.Menu;
+
+/* There isn't presently a way to globally change the theme of a whole application at runtime, just
+ * individual activities. So, each activity has to set its theme before any views are created. And
+ * the most expedient way to accomplish this was to put it in a base class and just have every
+ * activity extend from it. */
+public class BaseActivity extends AppCompatActivity {
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean("lightTheme", false)) {
+            setTheme(R.style.AppTheme_Light);
+        }
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        TypedValue value = new TypedValue();
+        int color;
+        if (getTheme().resolveAttribute(R.attr.toolbar_icon_tint, value, true)) {
+            color = value.data;
+        } else {
+            color = Color.WHITE;
+        }
+        for (int i = 0; i < menu.size(); i++) {
+            Drawable icon = menu.getItem(i).getIcon();
+            if (icon != null) {
+                icon.setColorFilter(color, PorterDuff.Mode.SRC_ATOP);
+            }
+        }
+        return super.onCreateOptionsMenu(menu);
+    }
+}
diff --git a/app/src/main/java/com/keylesspalace/tusky/ComposeActivity.java b/app/src/main/java/com/keylesspalace/tusky/ComposeActivity.java
index 6c6d5ae4..beac9903 100644
--- a/app/src/main/java/com/keylesspalace/tusky/ComposeActivity.java
+++ b/app/src/main/java/com/keylesspalace/tusky/ComposeActivity.java
@@ -24,6 +24,7 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.content.res.Resources;
+import android.content.res.TypedArray;
 import android.database.Cursor;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
@@ -40,12 +41,12 @@ import android.support.annotation.Nullable;
 import android.support.design.widget.Snackbar;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.content.ContextCompat;
-import android.support.v7.app.AppCompatActivity;
 import android.text.Editable;
 import android.text.Spannable;
 import android.text.Spanned;
 import android.text.TextWatcher;
 import android.text.style.ForegroundColorSpan;
+import android.util.TypedValue;
 import android.view.View;
 import android.webkit.MimeTypeMap;
 import android.widget.Button;
@@ -71,18 +72,14 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Comparator;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Random;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 
-public class ComposeActivity extends AppCompatActivity {
+public class ComposeActivity extends BaseActivity {
     private static final int STATUS_CHARACTER_LIMIT = 500;
     private static final int STATUS_MEDIA_SIZE_LIMIT = 4000000; // 4MB
     private static final int MEDIA_PICK_RESULT = 1;
@@ -103,64 +100,28 @@ public class ComposeActivity extends AppCompatActivity {
     private View contentWarningBar;
 
     private static class QueuedMedia {
-        public enum Type {
+        enum Type {
             IMAGE,
             VIDEO
         }
 
-        public enum ReadyStage {
+        enum ReadyStage {
             DOWNSIZING,
             UPLOADING,
         }
 
-        private Type type;
-        private ImageView preview;
-        private Uri uri;
-        private String id;
-        private ReadyStage readyStage;
-        private byte[] content;
+        Type type;
+        ImageView preview;
+        Uri uri;
+        String id;
+        ReadyStage readyStage;
+        byte[] content;
 
-        public QueuedMedia(Type type, Uri uri, ImageView preview) {
+        QueuedMedia(Type type, Uri uri, ImageView preview) {
             this.type = type;
             this.uri = uri;
             this.preview = preview;
         }
-
-        public Type getType() {
-            return type;
-        }
-
-        public ImageView getPreview() {
-            return preview;
-        }
-
-        public Uri getUri() {
-            return uri;
-        }
-
-        public String getId() {
-            return id;
-        }
-
-        public byte[] getContent() {
-            return content;
-        }
-
-        public ReadyStage getReadyStage() {
-            return readyStage;
-        }
-
-        public void setId(String id) {
-            this.id = id;
-        }
-
-        public void setReadyStage(ReadyStage readyStage) {
-            this.readyStage = readyStage;
-        }
-
-        public void setContent(byte[] content) {
-            this.content = content;
-        }
     }
 
     private void doErrorDialog(int descriptionId, int actionId, View.OnClickListener listener) {
@@ -175,10 +136,10 @@ public class ComposeActivity extends AppCompatActivity {
     }
 
     private static class FindCharsResult {
-        public int charIndex;
-        public int stringIndex;
+        int charIndex;
+        int stringIndex;
 
-        public FindCharsResult() {
+        FindCharsResult() {
             charIndex = -1;
             stringIndex = -1;
         }
@@ -281,6 +242,15 @@ public class ComposeActivity extends AppCompatActivity {
         }
     }
 
+    private static int getThemeColor(Context context, int attribute) {
+        TypedValue value = new TypedValue();
+        if (context.getTheme().resolveAttribute(attribute, value, true)) {
+            return value.data;
+        } else {
+            return android.R.color.black;
+        }
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -300,7 +270,7 @@ public class ComposeActivity extends AppCompatActivity {
 
         textEditor = (EditText) findViewById(R.id.field_status);
         final TextView charactersLeft = (TextView) findViewById(R.id.characters_left);
-        final int mentionColour = ContextCompat.getColor(this, R.color.compose_mention);
+        final int mentionColour = getThemeColor(this, R.attr.compose_mention_color);
         TextWatcher textEditorWatcher = new TextWatcher() {
             @Override
             public void onTextChanged(CharSequence s, int start, int before, int count) {
@@ -414,7 +384,7 @@ public class ComposeActivity extends AppCompatActivity {
             }
             JSONArray media_ids = new JSONArray();
             for (QueuedMedia item : mediaQueued) {
-                media_ids.put(item.getId());
+                media_ids.put(item.id);
             }
             if (media_ids.length() > 0) {
                 parameters.put("media_ids", media_ids);
@@ -429,12 +399,13 @@ public class ComposeActivity extends AppCompatActivity {
                     public void onResponse(JSONObject response) {
                         onSendSuccess();
                     }
-                }, new Response.ErrorListener() {
-            @Override
-            public void onErrorResponse(VolleyError error) {
-                onSendFailure();
-            }
-        }) {
+                },
+                new Response.ErrorListener() {
+                    @Override
+                    public void onErrorResponse(VolleyError error) {
+                        onSendFailure();
+                    }
+                }) {
             @Override
             public Map<String, String> getHeaders() throws AuthFailureError {
                 Map<String, String> headers = new HashMap<>();
@@ -454,8 +425,8 @@ public class ComposeActivity extends AppCompatActivity {
         textEditor.setError(getString(R.string.error_sending_status));
     }
 
-    private void readyStatus(final String content, final String visibility,
-                             final boolean sensitive, final String spoilerText) {
+    private void readyStatus(final String content, final String visibility, final boolean sensitive,
+            final String spoilerText) {
         final ProgressDialog dialog = ProgressDialog.show(
                 this, getString(R.string.dialog_title_finishing_media_upload),
                 getString(R.string.dialog_message_uploading_media), true, true);
@@ -570,7 +541,7 @@ public class ComposeActivity extends AppCompatActivity {
 
     private void addMediaToQueue(QueuedMedia.Type type, Bitmap preview, Uri uri, long mediaSize) {
         final QueuedMedia item = new QueuedMedia(type, uri, new ImageView(this));
-        ImageView view = item.getPreview();
+        ImageView view = item.preview;
         Resources resources = getResources();
         int side = resources.getDimensionPixelSize(R.dimen.compose_media_preview_side);
         int margin = resources.getDimensionPixelSize(R.dimen.compose_media_preview_margin);
@@ -598,7 +569,7 @@ public class ComposeActivity extends AppCompatActivity {
             textEditor.setPadding(textEditor.getPaddingLeft(), textEditor.getPaddingTop(),
                     textEditor.getPaddingRight(), totalHeight);
             // If there's one video in the queue it is full, so disable the button to queue more.
-            if (item.getType() == QueuedMedia.Type.VIDEO) {
+            if (item.type == QueuedMedia.Type.VIDEO) {
                 disableMediaPicking();
             }
         } else if (queuedCount >= Status.MAX_MEDIA_ATTACHMENTS) {
@@ -617,7 +588,7 @@ public class ComposeActivity extends AppCompatActivity {
     }
 
     private void removeMediaFromQueue(QueuedMedia item) {
-        mediaPreviewBar.removeView(item.getPreview());
+        mediaPreviewBar.removeView(item.preview);
         mediaQueued.remove(item);
         if (mediaQueued.size() == 0) {
             showMarkSensitive(false);
@@ -639,10 +610,10 @@ public class ComposeActivity extends AppCompatActivity {
     }
 
     private void downsizeMedia(final QueuedMedia item) {
-        item.setReadyStage(QueuedMedia.ReadyStage.DOWNSIZING);
+        item.readyStage = QueuedMedia.ReadyStage.DOWNSIZING;
         InputStream stream;
         try {
-            stream = getContentResolver().openInputStream(item.getUri());
+            stream = getContentResolver().openInputStream(item.uri);
         } catch (FileNotFoundException e) {
             onMediaDownsizeFailure(item);
             return;
@@ -652,7 +623,7 @@ public class ComposeActivity extends AppCompatActivity {
         new DownsizeImageTask(STATUS_MEDIA_SIZE_LIMIT, new DownsizeImageTask.Listener() {
             @Override
             public void onSuccess(List<byte[]> contentList) {
-                item.setContent(contentList.get(0));
+                item.content = contentList.get(0);
                 uploadMedia(item);
             }
 
@@ -695,7 +666,7 @@ public class ComposeActivity extends AppCompatActivity {
     }
 
     private void uploadMedia(final QueuedMedia item) {
-        item.setReadyStage(QueuedMedia.ReadyStage.UPLOADING);
+        item.readyStage = QueuedMedia.ReadyStage.UPLOADING;
 
         String endpoint = getString(R.string.endpoint_media);
         String url = "https://" + domain + endpoint;
@@ -714,7 +685,7 @@ public class ComposeActivity extends AppCompatActivity {
                     @Override
                     public void onResponse(JSONObject response) {
                         try {
-                            item.setId(response.getString("id"));
+                            item.id = response.getString("id");
                         } catch (JSONException e) {
                             onUploadFailure(item);
                             return;
@@ -736,11 +707,11 @@ public class ComposeActivity extends AppCompatActivity {
 
             @Override
             public DataItem getData() {
-                byte[] content = item.getContent();
+                byte[] content = item.content;
                 if (content == null) {
                     InputStream stream;
                     try {
-                        stream = getContentResolver().openInputStream(item.getUri());
+                        stream = getContentResolver().openInputStream(item.uri);
                     } catch (FileNotFoundException e) {
                         return null;
                     }
@@ -758,7 +729,7 @@ public class ComposeActivity extends AppCompatActivity {
                 return data;
             }
         };
-        request.addMarker("media_" + item.getUri().toString());
+        request.addMarker("media_" + item.uri.toString());
         VolleySingleton.getInstance(this).addToRequestQueue(request);
     }
 
@@ -768,8 +739,8 @@ public class ComposeActivity extends AppCompatActivity {
     }
 
     private void cancelReadyingMedia(QueuedMedia item) {
-        if (item.getReadyStage() == QueuedMedia.ReadyStage.UPLOADING) {
-            VolleySingleton.getInstance(this).cancelRequest("media_" + item.getUri().toString());
+        if (item.readyStage == QueuedMedia.ReadyStage.UPLOADING) {
+            VolleySingleton.getInstance(this).cancelRequest("media_" + item.uri.toString());
         }
         waitForMediaLatch.countDown();
     }
@@ -799,7 +770,7 @@ public class ComposeActivity extends AppCompatActivity {
                             return;
                         }
                         if (mediaQueued.size() > 0
-                                && mediaQueued.get(0).getType() == QueuedMedia.Type.IMAGE) {
+                                && mediaQueued.get(0).type == QueuedMedia.Type.IMAGE) {
                             displayTransientError(R.string.error_media_upload_image_or_video);
                             return;
                         }
diff --git a/app/src/main/java/com/keylesspalace/tusky/LoginActivity.java b/app/src/main/java/com/keylesspalace/tusky/LoginActivity.java
index 4f80550b..582cdf9c 100644
--- a/app/src/main/java/com/keylesspalace/tusky/LoginActivity.java
+++ b/app/src/main/java/com/keylesspalace/tusky/LoginActivity.java
@@ -22,7 +22,6 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.net.Uri;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.view.View;
 import android.widget.Button;
@@ -42,7 +41,7 @@ import java.net.URLEncoder;
 import java.util.HashMap;
 import java.util.Map;
 
-public class LoginActivity extends AppCompatActivity {
+public class LoginActivity extends BaseActivity {
     private static final String TAG = "LoginActivity";
     private static String OAUTH_SCOPES = "read write follow";
 
@@ -279,7 +278,7 @@ public class LoginActivity extends AppCompatActivity {
                 errorText.setText(error);
             } else {
                 // This case means a junk response was received somehow.
-                errorText.setText("An unidentified authorization error occurred.");
+                errorText.setText(getString(R.string.error_authorization_unknown));
             }
         }
     }
diff --git a/app/src/main/java/com/keylesspalace/tusky/MainActivity.java b/app/src/main/java/com/keylesspalace/tusky/MainActivity.java
index b74a6247..317e3a97 100644
--- a/app/src/main/java/com/keylesspalace/tusky/MainActivity.java
+++ b/app/src/main/java/com/keylesspalace/tusky/MainActivity.java
@@ -24,10 +24,8 @@ import android.os.SystemClock;
 import android.preference.PreferenceManager;
 import android.support.design.widget.TabLayout;
 import android.support.v4.view.ViewPager;
-import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.support.v7.widget.Toolbar;
-import android.util.TypedValue;
 import android.view.Menu;
 import android.view.MenuItem;
 
@@ -43,7 +41,7 @@ import org.json.JSONObject;
 import java.util.HashMap;
 import java.util.Map;
 
-public class MainActivity extends AppCompatActivity {
+public class MainActivity extends BaseActivity {
     private static final String TAG = "MainActivity"; // logging tag
 
     private AlarmManager alarmManager;
@@ -102,20 +100,6 @@ public class MainActivity extends AppCompatActivity {
         } else {
             alarmManager.cancel(serviceAlarmIntent);
         }
-
-        /* @Unused: for Firebase Push Notifications
-        Log.d(TAG, "token " + FirebaseInstanceId.getInstance().getToken());
-
-        // Check if it's necessary to register for push notifications for this instance.
-        boolean registered = preferences.getBoolean("firebaseRegistered", false);
-        if (!registered) {
-            String registrationId = preferences.getString("firebaseRegistrationId", null);
-            if (registrationId == null) {
-                registrationId = FirebaseInstanceId.getInstance().getToken();
-            }
-            sendRegistrationToServer(registrationId, true);
-        }
-        */
     }
 
     private void fetchUserInfo() {
@@ -180,71 +164,6 @@ public class MainActivity extends AppCompatActivity {
         Log.e(TAG, "Failed to fetch user info. " + exception.getMessage());
     }
 
-    /* @Unused: For Firebase push notifications, useless for now.
-    private void sendRegistrationToServer(String token, final boolean register) {
-        SharedPreferences preferences = getSharedPreferences(
-                getString(R.string.preferences_file_key), Context.MODE_PRIVATE);
-        String domain = preferences.getString("domain", null);
-        final String accessToken = preferences.getString("accessToken", null);
-
-        String endpoint;
-        if (register) {
-            endpoint = getString(R.string.endpoint_devices_register);
-        } else {
-            endpoint = getString(R.string.endpoint_devices_unregister);
-        }
-        String url = "https://" + domain + endpoint;
-        JSONObject formData = new JSONObject();
-        try {
-            formData.put("registration_id", token);
-        } catch (JSONException e) {
-            onSendRegistrationToServerFailure();
-            return;
-        }
-        JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url, formData,
-                new Response.Listener<JSONObject>() {
-                    @Override
-                    public void onResponse(JSONObject response) {
-                        onSendRegistrationToServerSuccess(response, register);
-                    }
-                },
-                new Response.ErrorListener() {
-                    @Override
-                    public void onErrorResponse(VolleyError error) {
-                        onSendRegistrationToServerFailure();
-                    }
-                }) {
-            @Override
-            public Map<String, String> getHeaders() throws AuthFailureError {
-                Map<String, String> headers = new HashMap<>();
-                headers.put("Authorization", "Bearer " + accessToken);
-                return headers;
-            }
-        };
-        VolleySingleton.getInstance(this).addToRequestQueue(request);
-    }
-
-    private void onSendRegistrationToServerSuccess(JSONObject response, boolean register) {
-        String registeredWord;
-        if (register) {
-            registeredWord = "registration";
-        } else {
-            registeredWord = "unregistration";
-        }
-        Log.d(TAG, String.format("Firebase %s is confirmed with the Mastodon instance. %s",
-                registeredWord, response.toString()));
-        SharedPreferences preferences = getSharedPreferences(
-                getString(R.string.preferences_file_key), Context.MODE_PRIVATE);
-        SharedPreferences.Editor editor = preferences.edit();
-        editor.putBoolean("firebaseRegistered", register);
-        editor.apply();
-    }
-
-    private void onSendRegistrationToServerFailure() {
-        Log.d(TAG, "Firebase registration with the Mastodon instance failed");
-    }
-    */
-
     private void compose() {
         Intent intent = new Intent(this, ComposeActivity.class);
         startActivity(intent);
diff --git a/app/src/main/java/com/keylesspalace/tusky/PreferencesActivity.java b/app/src/main/java/com/keylesspalace/tusky/PreferencesActivity.java
index f09c6d23..22187c71 100644
--- a/app/src/main/java/com/keylesspalace/tusky/PreferencesActivity.java
+++ b/app/src/main/java/com/keylesspalace/tusky/PreferencesActivity.java
@@ -15,16 +15,79 @@
 
 package com.keylesspalace.tusky;
 
+import android.content.Intent;
+import android.content.SharedPreferences;
 import android.os.Bundle;
+import android.preference.PreferenceManager;
 import android.support.annotation.Nullable;
 import android.support.v7.app.AppCompatActivity;
 
-public class PreferencesActivity extends AppCompatActivity {
+public class PreferencesActivity extends AppCompatActivity
+        implements SharedPreferences.OnSharedPreferenceChangeListener {
+    private boolean themeSwitched;
+
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        if (savedInstanceState != null) {
+            themeSwitched = savedInstanceState.getBoolean("themeSwitched");
+        } else {
+            Bundle extras = getIntent().getExtras();
+            if (extras != null) {
+                themeSwitched = extras.getBoolean("themeSwitched");
+            } else {
+                themeSwitched = false;
+            }
+        }
+
+        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
+        if (preferences.getBoolean("lightTheme", false)) {
+            setTheme(R.style.AppTheme_Light);
+        }
+        preferences.registerOnSharedPreferenceChangeListener(this);
+
         getFragmentManager().beginTransaction()
                 .replace(android.R.id.content, new PreferencesFragment())
                 .commit();
     }
+
+    private void saveInstanceState(Bundle outState) {
+        outState.putBoolean("themeSwitched", themeSwitched);
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        saveInstanceState(outState);
+        super.onSaveInstanceState(outState);
+    }
+
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+        if (key.equals("lightTheme")) {
+            themeSwitched = true;
+            // recreate() could be used instead, but it doesn't have an animation B).
+            Intent intent = getIntent();
+            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
+            Bundle savedInstanceState = new Bundle();
+            saveInstanceState(savedInstanceState);
+            intent.putExtras(savedInstanceState);
+            startActivity(intent);
+            finish();
+            overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
+        }
+    }
+
+    @Override
+    public void onBackPressed() {
+        /* Switching themes won't actually change the theme of activities on the back stack.
+         * Either the back stack activities need to all be recreated, or do the easier thing, which
+         * is hijack the back button press and use it to launch a new MainActivity and clear the
+         * back stack. */
+        if (themeSwitched) {
+            Intent intent = new Intent(this, MainActivity.class);
+            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
+            startActivity(intent);
+        } else {
+            super.onBackPressed();
+        }
+    }
 }
diff --git a/app/src/main/java/com/keylesspalace/tusky/SplashActivity.java b/app/src/main/java/com/keylesspalace/tusky/SplashActivity.java
index 107f25b3..1297196c 100644
--- a/app/src/main/java/com/keylesspalace/tusky/SplashActivity.java
+++ b/app/src/main/java/com/keylesspalace/tusky/SplashActivity.java
@@ -20,7 +20,6 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
-import android.support.v7.app.AppCompatDelegate;
 
 public class SplashActivity extends AppCompatActivity {
     @Override
diff --git a/app/src/main/java/com/keylesspalace/tusky/Status.java b/app/src/main/java/com/keylesspalace/tusky/Status.java
index ecfe2704..6d018b3f 100644
--- a/app/src/main/java/com/keylesspalace/tusky/Status.java
+++ b/app/src/main/java/com/keylesspalace/tusky/Status.java
@@ -43,7 +43,7 @@ public class Status {
     private Spanned content;
     /** the fully-qualified url of the avatar image */
     private String avatar;
-    private String rebloggedByUsername;
+    private String rebloggedByDisplayName;
     /** when the status was initially created */
     private Date createdAt;
     /** whether the authenticated user has reblogged this status */
@@ -104,8 +104,8 @@ public class Status {
         return createdAt;
     }
 
-    public String getRebloggedByUsername() {
-        return rebloggedByUsername;
+    public String getRebloggedByDisplayName() {
+        return rebloggedByDisplayName;
     }
 
     public boolean getReblogged() {
@@ -136,8 +136,8 @@ public class Status {
         return mentions;
     }
 
-    public void setRebloggedByUsername(String name) {
-        rebloggedByUsername = name;
+    public void setRebloggedByDisplayName(String name) {
+        rebloggedByDisplayName = name;
     }
 
     public void setReblogged(boolean reblogged) {
@@ -257,7 +257,7 @@ public class Status {
         Status status;
         if (reblog != null) {
             status = reblog;
-            status.setRebloggedByUsername(username);
+            status.setRebloggedByDisplayName(displayName);
         } else {
             Spanned contentPlus = HtmlUtils.fromHtml(content);
             status = new Status(
diff --git a/app/src/main/java/com/keylesspalace/tusky/StatusViewHolder.java b/app/src/main/java/com/keylesspalace/tusky/StatusViewHolder.java
index 7383214f..bfccc1f7 100644
--- a/app/src/main/java/com/keylesspalace/tusky/StatusViewHolder.java
+++ b/app/src/main/java/com/keylesspalace/tusky/StatusViewHolder.java
@@ -26,7 +26,6 @@ import android.text.style.URLSpan;
 import android.view.View;
 import android.widget.CompoundButton;
 import android.widget.ImageButton;
-import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.ToggleButton;
 
@@ -43,7 +42,7 @@ public class StatusViewHolder extends RecyclerView.ViewHolder {
     private TextView content;
     private NetworkImageView avatar;
     private View rebloggedBar;
-    private TextView rebloggedByUsername;
+    private TextView rebloggedByDisplayName;
     private ImageButton replyButton;
     private StatusButton reblogButton;
     private StatusButton favouriteButton;
@@ -70,7 +69,7 @@ public class StatusViewHolder extends RecyclerView.ViewHolder {
         avatar.setDefaultImageResId(R.drawable.avatar_default);
         avatar.setErrorImageResId(R.drawable.avatar_error);
         rebloggedBar = itemView.findViewById(R.id.status_reblogged_bar);
-        rebloggedByUsername = (TextView) itemView.findViewById(R.id.status_reblogged);
+        rebloggedByDisplayName = (TextView) itemView.findViewById(R.id.status_reblogged);
         replyButton = (ImageButton) itemView.findViewById(R.id.status_reply);
         reblogButton = (StatusButton) itemView.findViewById(R.id.status_reblog);
         favouriteButton = (StatusButton) itemView.findViewById(R.id.status_favourite);
@@ -174,15 +173,15 @@ public class StatusViewHolder extends RecyclerView.ViewHolder {
         sinceCreated.setText(readout);
     }
 
-    public void setRebloggedByUsername(String name) {
-        Context context = rebloggedByUsername.getContext();
+    public void setRebloggedByDisplayName(String name) {
+        Context context = rebloggedByDisplayName.getContext();
         String format = context.getString(R.string.status_boosted_format);
         String boostedText = String.format(format, name);
-        rebloggedByUsername.setText(boostedText);
+        rebloggedByDisplayName.setText(boostedText);
         rebloggedBar.setVisibility(View.VISIBLE);
     }
 
-    public void hideRebloggedByUsername() {
+    public void hideRebloggedByDisplayName() {
         rebloggedBar.setVisibility(View.GONE);
     }
 
@@ -332,11 +331,11 @@ public class StatusViewHolder extends RecyclerView.ViewHolder {
         setAvatar(status.getAvatar());
         setReblogged(status.getReblogged());
         setFavourited(status.getFavourited());
-        String rebloggedByUsername = status.getRebloggedByUsername();
-        if (rebloggedByUsername == null) {
-            hideRebloggedByUsername();
+        String rebloggedByDisplayName = status.getRebloggedByDisplayName();
+        if (rebloggedByDisplayName == null) {
+            hideRebloggedByDisplayName();
         } else {
-            setRebloggedByUsername(rebloggedByUsername);
+            setRebloggedByDisplayName(rebloggedByDisplayName);
         }
         Status.MediaAttachment[] attachments = status.getAttachments();
         boolean sensitive = status.getSensitive();
diff --git a/app/src/main/java/com/keylesspalace/tusky/ViewTagActivity.java b/app/src/main/java/com/keylesspalace/tusky/ViewTagActivity.java
index dd3c26e8..39dcef2f 100644
--- a/app/src/main/java/com/keylesspalace/tusky/ViewTagActivity.java
+++ b/app/src/main/java/com/keylesspalace/tusky/ViewTagActivity.java
@@ -20,10 +20,9 @@ import android.support.annotation.Nullable;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentTransaction;
 import android.support.v7.app.ActionBar;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 
-public class ViewTagActivity extends AppCompatActivity {
+public class ViewTagActivity extends BaseActivity {
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
diff --git a/app/src/main/java/com/keylesspalace/tusky/ViewThreadActivity.java b/app/src/main/java/com/keylesspalace/tusky/ViewThreadActivity.java
index c6e31a8e..3250d50e 100644
--- a/app/src/main/java/com/keylesspalace/tusky/ViewThreadActivity.java
+++ b/app/src/main/java/com/keylesspalace/tusky/ViewThreadActivity.java
@@ -21,13 +21,11 @@ import android.support.annotation.Nullable;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentTransaction;
 import android.support.v7.app.ActionBar;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuItem;
 
-public class ViewThreadActivity extends AppCompatActivity {
-
+public class ViewThreadActivity extends BaseActivity {
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
diff --git a/app/src/main/res/anim/fade_in.xml b/app/src/main/res/anim/fade_in.xml
new file mode 100644
index 00000000..972e757e
--- /dev/null
+++ b/app/src/main/res/anim/fade_in.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<alpha xmlns:android="http://schemas.android.com/apk/res/android"
+    android:interpolator="@android:anim/linear_interpolator"
+    android:fromAlpha="0"
+    android:toAlpha="1"
+    android:duration="300" />
\ No newline at end of file
diff --git a/app/src/main/res/anim/fade_out.xml b/app/src/main/res/anim/fade_out.xml
new file mode 100644
index 00000000..9b48ae8f
--- /dev/null
+++ b/app/src/main/res/anim/fade_out.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<alpha xmlns:android="http://schemas.android.com/apk/res/android"
+    android:interpolator="@android:anim/linear_interpolator"
+    android:fromAlpha="1"
+    android:toAlpha="0"
+    android:duration="300" />
\ No newline at end of file
diff --git a/app/src/main/res/color/favourite_button_light.xml b/app/src/main/res/color/favourite_button_light.xml
new file mode 100644
index 00000000..c9511a3c
--- /dev/null
+++ b/app/src/main/res/color/favourite_button_light.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item android:color="#BFAF00" app:state_marked="true" />
+    <item android:color="#4F4F4F" />
+</selector>
\ No newline at end of file
diff --git a/app/src/main/res/color/media_button_light.xml b/app/src/main/res/color/media_button_light.xml
new file mode 100644
index 00000000..73da3f03
--- /dev/null
+++ b/app/src/main/res/color/media_button_light.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:color="#8F8F8F" android:state_enabled="false" />
+    <item android:color="#000000" />
+</selector>
\ No newline at end of file
diff --git a/app/src/main/res/color/reblog_button_light.xml b/app/src/main/res/color/reblog_button_light.xml
new file mode 100644
index 00000000..a2fb223c
--- /dev/null
+++ b/app/src/main/res/color/reblog_button_light.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item android:color="#009F6F" app:state_marked="true" />
+    <item android:color="#BFBFBF" android:state_enabled="false" />
+    <item android:color="#4F4F4F" />
+</selector>
\ No newline at end of file
diff --git a/app/src/main/res/drawable/media_preview_unloaded.xml b/app/src/main/res/drawable/media_preview_unloaded.xml
index 76a1e531..9ff8a8d1 100644
--- a/app/src/main/res/drawable/media_preview_unloaded.xml
+++ b/app/src/main/res/drawable/media_preview_unloaded.xml
@@ -3,7 +3,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle">
 
-    <solid android:color="@color/media_preview_unloaded_background" />
+    <solid android:color="?attr/media_preview_unloaded_background_color" />
 
     <stroke
         android:dashWidth="4dp"
diff --git a/app/src/main/res/drawable/toggle_small.xml b/app/src/main/res/drawable/toggle_small.xml
index b0289597..03947856 100644
--- a/app/src/main/res/drawable/toggle_small.xml
+++ b/app/src/main/res/drawable/toggle_small.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle">
-    <solid android:color="#ffafafaf" />
+    <solid android:color="#ff4f575f" />
     <corners android:radius="2dp" />
 </shape>
\ No newline at end of file
diff --git a/app/src/main/res/drawable/toggle_small_light.xml b/app/src/main/res/drawable/toggle_small_light.xml
new file mode 100644
index 00000000..6f317d60
--- /dev/null
+++ b/app/src/main/res/drawable/toggle_small_light.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="#ffefefef" />
+    <corners android:radius="2dp" />
+</shape>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_account.xml b/app/src/main/res/layout/activity_account.xml
index 02f73c95..e99535c8 100644
--- a/app/src/main/res/layout/activity_account.xml
+++ b/app/src/main/res/layout/activity_account.xml
@@ -79,7 +79,7 @@
                 android:id="@+id/toolbar"
                 android:layout_width="match_parent"
                 android:layout_height="?attr/actionBarSize"
-                android:background="@color/colorPrimary"
+                android:background="?attr/toolbar_background_color"
                 android:layout_gravity="top"
                 app:layout_collapseMode="pin" />
 
diff --git a/app/src/main/res/layout/activity_login.xml b/app/src/main/res/layout/activity_login.xml
index b913af60..124130cb 100644
--- a/app/src/main/res/layout/activity_login.xml
+++ b/app/src/main/res/layout/activity_login.xml
@@ -10,8 +10,8 @@
         android:id="@+id/toolbar"
         android:layout_width="match_parent"
         android:layout_height="?attr/actionBarSize"
-        android:background="@color/colorPrimary"
-        android:elevation="4dp" />
+        android:elevation="4dp"
+        android:background="?attr/toolbar_background_color" />
 
     <RelativeLayout
         android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 84cd8451..72f921ca 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/activity_main"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -20,8 +19,8 @@
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
-            android:background="@color/colorPrimary"
-            android:elevation="4dp" />
+            android:elevation="4dp"
+            android:background="?attr/toolbar_background_color" />
 
         <android.support.v4.view.ViewPager
             android:id="@+id/pager"
diff --git a/app/src/main/res/layout/activity_view_tag.xml b/app/src/main/res/layout/activity_view_tag.xml
index 39974cc2..93c3b732 100644
--- a/app/src/main/res/layout/activity_view_tag.xml
+++ b/app/src/main/res/layout/activity_view_tag.xml
@@ -15,8 +15,8 @@
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
-            android:background="@color/colorPrimary"
-            android:elevation="4dp" />
+            android:elevation="4dp"
+            android:background="?attr/toolbar_background_color" />
 
         <FrameLayout
             android:id="@+id/fragment_container"
diff --git a/app/src/main/res/layout/activity_view_thread.xml b/app/src/main/res/layout/activity_view_thread.xml
index 4625578b..a8cc6100 100644
--- a/app/src/main/res/layout/activity_view_thread.xml
+++ b/app/src/main/res/layout/activity_view_thread.xml
@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/activity_view_thread"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -16,8 +15,8 @@
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
-            android:background="@color/colorPrimary"
-            android:elevation="4dp" />
+            android:elevation="4dp"
+            android:background="?attr/toolbar_background_color" />
 
         <FrameLayout
             android:id="@+id/fragment_container"
diff --git a/app/src/main/res/layout/item_status.xml b/app/src/main/res/layout/item_status.xml
index 98459f67..ae946930 100644
--- a/app/src/main/res/layout/item_status.xml
+++ b/app/src/main/res/layout/item_status.xml
@@ -19,7 +19,8 @@
             app:srcCompat="@drawable/ic_reblogged"
             android:id="@+id/status_reblogged_icon"
             android:paddingRight="@dimen/status_avatar_padding"
-            android:paddingLeft="@dimen/status_reblogged_icon_left_padding" />
+            android:paddingLeft="@dimen/status_reblogged_icon_left_padding"
+            android:tint="?attr/notification_icon_tint" />
 
         <TextView
             android:layout_width="wrap_content"
@@ -121,7 +122,7 @@
             android:layout_height="wrap_content"
             android:layout_marginTop="@dimen/status_media_preview_top_margin"
             android:padding="8dp"
-            android:background="@color/sensitive_media_warning_background"
+            android:background="?attr/sensitive_media_warning_background_color"
             android:orientation="vertical"
             android:visibility="gone">
 
@@ -182,6 +183,7 @@
                 android:layout_height="@dimen/status_media_preview_height"
                 android:layout_weight="1"
                 android:scaleType="centerCrop" />
+
         </LinearLayout>
 
     </LinearLayout>
@@ -198,9 +200,9 @@
         <ImageButton
             app:srcCompat="@drawable/ic_reply"
             android:id="@+id/status_reply"
-            style="?attr/image_button_style"
             android:layout_width="32dp"
-            android:layout_height="32dp" />
+            android:layout_height="32dp"
+            style="?attr/image_button_style" />
 
         <Space
             android:layout_width="0dp"
@@ -210,7 +212,7 @@
         <com.keylesspalace.tusky.StatusButton
             app:srcCompat="@drawable/ic_reblog"
             android:id="@+id/status_reblog"
-            style="?attr/reblog_button_style"
+            style="?attr/status_reblog_button_style"
             android:layout_width="32dp"
             android:layout_height="32dp" />
 
@@ -222,7 +224,7 @@
         <com.keylesspalace.tusky.StatusButton
             android:layout_width="32dp"
             android:layout_height="32dp"
-            style="?attr/favourite_button_style"
+            style="?attr/status_favourite_button_style"
             app:srcCompat="@drawable/ic_favourite"
             android:id="@+id/status_favourite" />
 
diff --git a/app/src/main/res/values/attrs.xml b/app/src/main/res/values/attrs.xml
index bc4c8a52..80ccdde1 100644
--- a/app/src/main/res/values/attrs.xml
+++ b/app/src/main/res/values/attrs.xml
@@ -11,16 +11,21 @@
     </declare-styleable>
 
     <!--Themed Attributes-->
+    <attr name="toolbar_background_color" format="reference" />
+    <attr name="toolbar_icon_tint" format="reference" />
     <attr name="image_button_style" format="reference" />
-    <attr name="favourite_button_style" format="reference" />
-    <attr name="reblog_button_style" format="reference" />
+    <attr name="status_favourite_button_style" format="reference" />
+    <attr name="status_reblog_button_style" format="reference" />
     <attr name="content_warning_button" format="reference" />
-    <attr name="notification_content" format="reference" />
-    <attr name="notification_icon_tint" format="reference|color" />
+    <attr name="sensitive_media_warning_background_color" format="reference|color" />
+    <attr name="media_preview_unloaded_background_color" format="reference|color" />
     <attr name="status_text_color_secondary" format="reference|color" />
     <attr name="status_divider_color" format="reference|color" />
     <attr name="tab_page_margin_color" format="reference|color" />
+    <attr name="notification_content" format="reference" />
+    <attr name="notification_icon_tint" format="reference|color" />
     <attr name="account_header_background_color" format="reference|color" />
     <attr name="compose_media_button_tint" format="reference|color" />
+    <attr name="compose_mention_color" format="reference|color" />
 
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index 003920a1..dfa06414 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,21 +1,58 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="colorPrimary">#44A673</color>
-    <color name="colorPrimaryDark">#2C996E</color>
-    <color name="colorAccent">#3F8A65</color>
-    <color name="colorBackground">#3C4945</color>
-    <color name="windowBackground">#191E1E</color>
+    <!--These colors are not affected by themes.-->
     <color name="splash_background">#4F4F4F</color>
-    <color name="button_dark">#3F8A65</color>
-    <color name="image_button_dark">#CFCFCF</color>
     <color name="view_video_background">#000000</color>
-    <color name="sensitive_media_warning_background">#303030</color>
-    <color name="media_preview_unloaded_background">#2F2F2F</color>
-    <color name="compose_mention">#AFBFCF</color>
-    <color name="notification_content_faded">#9F9F9F</color>
-    <color name="notification_icon_tint">#CFCFCF</color>
+    <!--Dark Theme Colors-->
+    <color name="color_primary_dark">#44A673</color>
+    <color name="color_primary_dark_dark">#2C996E</color> <!--Dark Dark-->
+    <color name="color_accent_dark">#3F8A65</color>
+    <color name="button_dark">#3F8A65</color>
+    <color name="color_background_dark">#3C4945</color>
+    <color name="window_background_dark">#191E1E</color>
+    <color name="edit_text_color_dark">#FFFFFF</color>
+    <color name="text_color_primary_dark">#FFFFFF</color>
+    <color name="text_color_secondary_dark">#FFFFFF</color>
+    <color name="text_color_tertiary_dark">#FFFFFF</color>
+    <color name="text_color_primary_inverse_dark">#000000</color>
+    <color name="text_color_secondary_inverse_dark">#000000</color>
+    <color name="text_color_tertiary_inverse_dark">#000000</color>
+    <color name="toolbar_background_dark">#44A673</color>
+    <color name="toolbar_icon_dark">#FFFFFF</color>
+    <color name="image_button_dark">#CFCFCF</color>
+    <color name="sensitive_media_warning_background_dark">#303030</color>
+    <color name="media_preview_unloaded_background_dark">#2F2F2F</color>
     <color name="status_text_secondary_dark">#A4B4BC</color>
     <color name="status_divider_dark">#000000</color>
     <color name="tab_page_margin_dark">#4C534B</color>
     <color name="account_header_background_dark">#000000</color>
+    <color name="compose_mention_dark">#AFBFCF</color>
+    <color name="notification_content_faded_dark">#9F9F9F</color>
+    <color name="notification_icon_tint_dark">#CFCFCF</color>
+    <!--Light Theme Colors-->
+    <color name="color_primary_light">#44A673</color>
+    <color name="color_primary_dark_light">#2C996E</color>
+    <color name="color_accent_light">#3F8A65</color>
+    <color name="button_light">#79daa8</color>
+    <color name="color_background_light">#FFFFFF</color>
+    <color name="window_background_light">#FFFFFF</color>
+    <color name="edit_text_color_light">#000000</color>
+    <color name="text_color_primary_light">#000000</color>
+    <color name="text_color_secondary_light">#000000</color>
+    <color name="text_color_tertiary_light">#000000</color>
+    <color name="text_color_primary_inverse_light">#FFFFFF</color>
+    <color name="text_color_secondary_inverse_light">#FFFFFF</color>
+    <color name="text_color_tertiary_inverse_light">#FFFFFF</color>
+    <color name="toolbar_background_light">#f6f7f7</color>
+    <color name="toolbar_icon_light">#000000</color>
+    <color name="image_button_light">#2F2F2F</color>
+    <color name="sensitive_media_warning_background_light">#B0B0B0</color>
+    <color name="media_preview_unloaded_background_light">#CFCFCF</color>
+    <color name="status_text_secondary_light">#34444C</color>
+    <color name="status_divider_light">#CFCFCF</color>
+    <color name="tab_page_margin_light">#9F9F9F</color>
+    <color name="account_header_background_light">#EFEFEF</color>
+    <color name="compose_mention_light">#2F5F6F</color>
+    <color name="notification_content_faded_light">#7F7F7F</color>
+    <color name="notification_icon_tint_light">#1F1F1F</color>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 83220dc6..0f82b3ba 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -41,6 +41,7 @@
     <string name="endpoint_devices_register">/api/v1/devices/register</string>
     <string name="endpoint_devices_unregister">/api/v1/devices/unregister</string>
 
+    <string name="error_authorization_unknown">An unidentified authorization error occurred.</string>
     <string name="error_fetching_notifications">Notifications could not be fetched.</string>
     <string name="error_compose_character_limit">The status is too long!</string>
     <string name="error_sending_status">The status failed to be sent.</string>
@@ -135,5 +136,7 @@
     <string name="pref_title_notification_alert_sound">Notify with a sound</string>
     <string name="pref_title_notification_style_vibrate">Notify with vibration</string>
     <string name="pref_title_notification_style_light">Notify with light</string>
+    <string name="pref_title_appearance_settings">Appearance</string>
+    <string name="pref_title_light_theme">Use The Light Theme</string>
 
 </resources>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index 77bb2375..8971cfb0 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,56 +1,117 @@
 <resources>
 
-    <!-- Base application theme (Dark). -->
+    <style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
+        <item name="android:windowBackground">@drawable/splash_background</item>
+    </style>
+
+    <!--Base Application Theme Styles (Dark)-->
+
     <style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
-        <item name="colorPrimary">@color/colorPrimary</item>
-        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
-        <item name="colorAccent">@color/colorAccent</item>
+        <item name="colorPrimary">@color/color_primary_dark</item>
+        <item name="colorPrimaryDark">@color/color_primary_dark_dark</item>
+        <item name="colorAccent">@color/color_accent_dark</item>
         <item name="colorButtonNormal">@color/button_dark</item>
 
-        <item name="android:colorBackground">@color/colorBackground</item>
-        <item name="android:windowBackground">@color/windowBackground</item>
-        <item name="android:editTextColor">#FFFFFF</item>
-        <item name="android:textColorPrimary">#FFFFFF</item>
-        <item name="android:textColorSecondary">#FFFFFF</item>
-        <item name="android:textColorTertiary">#FFFFFF</item>
-        <item name="android:textColorPrimaryInverse">#000000</item>
-        <item name="android:textColorSecondaryInverse">#000000</item>
-        <item name="android:textColorTertiaryInverse">#000000</item>
+        <item name="android:colorBackground">@color/color_background_dark</item>
+        <item name="android:windowBackground">@color/window_background_dark</item>
+        <item name="android:editTextColor">@color/edit_text_color_dark</item>
+        <item name="android:textColorPrimary">@color/text_color_primary_dark</item>
+        <item name="android:textColorSecondary">@color/text_color_secondary_dark</item>
+        <item name="android:textColorTertiary">@color/text_color_tertiary_dark</item>
+        <item name="android:textColorPrimaryInverse">@color/text_color_primary_inverse_dark</item>
+        <item name="android:textColorSecondaryInverse">@color/text_color_secondary_inverse_dark</item>
+        <item name="android:textColorTertiaryInverse">@color/text_color_tertiary_inverse_dark</item>
 
         <item name="bottomSheetDialogTheme">@style/AppTheme.BottomSheetDialog.Dark</item>
 
-        <item name="notification_content">@color/notification_content_faded</item>
-        <item name="notification_icon_tint">@color/notification_icon_tint</item>
+        <item name="toolbar_background_color">@color/toolbar_background_dark</item>
+        <item name="toolbar_icon_tint">@color/toolbar_icon_dark</item>
         <item name="image_button_style">@style/AppTheme.ImageButton.Dark</item>
-        <item name="favourite_button_style">@style/AppTheme.FavouriteButton.Dark</item>
-        <item name="reblog_button_style">@style/AppTheme.ReblogButton.Dark</item>
+        <item name="status_reblog_button_style">@style/AppTheme.ReblogButton.Dark</item>
+        <item name="status_favourite_button_style">@style/AppTheme.FavouriteButton.Dark</item>
         <item name="content_warning_button">@drawable/toggle_small</item>
+        <item name="sensitive_media_warning_background_color">@color/sensitive_media_warning_background_dark</item>
+        <item name="media_preview_unloaded_background_color">@color/media_preview_unloaded_background_dark</item>
         <item name="status_text_color_secondary">@color/status_text_secondary_dark</item>
         <item name="status_divider_color">@color/status_divider_dark</item>
         <item name="tab_page_margin_color">@color/tab_page_margin_dark</item>
         <item name="account_header_background_color">@color/account_header_background_dark</item>
         <item name="compose_media_button_tint">@color/media_button_dark</item>
+        <item name="compose_mention_color">@color/compose_mention_dark</item>
+        <item name="notification_content">@color/notification_content_faded_dark</item>
+        <item name="notification_icon_tint">@color/notification_icon_tint_dark</item>
     </style>
 
     <style name="AppTheme.ImageButton.Dark" parent="@style/Widget.AppCompat.Button.Borderless.Colored">
         <item name="android:tint">@color/image_button_dark</item>
     </style>
 
-    <style name="AppTheme.FavouriteButton.Dark" parent="@style/Widget.AppCompat.Button.Borderless.Colored">
-        <item name="android:tint">@color/favourite_button_dark</item>
-    </style>
-
     <style name="AppTheme.ReblogButton.Dark" parent="@style/Widget.AppCompat.Button.Borderless.Colored">
         <item name="android:tint">@color/reblog_button_dark</item>
     </style>
 
-    <style name="AppTheme.BottomSheetDialog.Dark" parent="@style/Theme.Design.BottomSheetDialog">
-        <item name="colorAccent">@color/colorAccent</item>
-        <item name="android:colorBackground">@color/colorBackground</item>
+    <style name="AppTheme.FavouriteButton.Dark" parent="@style/Widget.AppCompat.Button.Borderless.Colored">
+        <item name="android:tint">@color/favourite_button_dark</item>
     </style>
 
-    <style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
-        <item name="android:windowBackground">@drawable/splash_background</item>
+    <style name="AppTheme.BottomSheetDialog.Dark" parent="@style/Theme.Design.BottomSheetDialog">
+        <item name="colorAccent">@color/color_accent_dark</item>
+        <item name="android:colorBackground">@color/color_background_dark</item>
+    </style>
+
+    <!--Light Application Theme Styles-->
+
+    <style name="AppTheme.Light" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="colorPrimary">@color/color_primary_light</item>
+        <item name="colorPrimaryDark">@color/color_primary_dark_light</item>
+        <item name="colorAccent">@color/color_accent_light</item>
+        <item name="colorButtonNormal">@color/button_light</item>
+
+        <item name="android:colorBackground">@color/color_background_light</item>
+        <item name="android:windowBackground">@color/window_background_light</item>
+        <item name="android:editTextColor">@color/edit_text_color_light</item>
+        <item name="android:textColorPrimary">@color/text_color_primary_light</item>
+        <item name="android:textColorSecondary">@color/text_color_secondary_light</item>
+        <item name="android:textColorTertiary">@color/text_color_tertiary_light</item>
+        <item name="android:textColorPrimaryInverse">@color/text_color_primary_inverse_light</item>
+        <item name="android:textColorSecondaryInverse">@color/text_color_secondary_inverse_light</item>
+        <item name="android:textColorTertiaryInverse">@color/text_color_tertiary_inverse_light</item>
+
+        <item name="bottomSheetDialogTheme">@style/AppTheme.BottomSheetDialog.Light</item>
+
+        <item name="toolbar_background_color">@color/toolbar_background_light</item>
+        <item name="toolbar_icon_tint">@color/toolbar_icon_light</item>
+        <item name="image_button_style">@style/AppTheme.ImageButton.Light</item>
+        <item name="status_reblog_button_style">@style/AppTheme.ReblogButton.Light</item>
+        <item name="status_favourite_button_style">@style/AppTheme.FavouriteButton.Light</item>
+        <item name="content_warning_button">@drawable/toggle_small_light</item>
+        <item name="sensitive_media_warning_background_color">@color/sensitive_media_warning_background_light</item>
+        <item name="media_preview_unloaded_background_color">@color/media_preview_unloaded_background_light</item>
+        <item name="status_text_color_secondary">@color/status_text_secondary_light</item>
+        <item name="status_divider_color">@color/status_divider_light</item>
+        <item name="tab_page_margin_color">@color/tab_page_margin_light</item>
+        <item name="account_header_background_color">@color/account_header_background_light</item>
+        <item name="compose_media_button_tint">@color/media_button_light</item>
+        <item name="compose_mention_color">@color/compose_mention_light</item>
+        <item name="notification_content">@color/notification_content_faded_light</item>
+        <item name="notification_icon_tint">@color/notification_icon_tint_light</item>
+    </style>
+
+    <style name="AppTheme.ImageButton.Light" parent="Widget.AppCompat.Button.Borderless.Colored">
+        <item name="android:tint">@color/image_button_light</item>
+    </style>
+
+    <style name="AppTheme.ReblogButton.Light" parent="Widget.AppCompat.Button.Borderless.Colored">
+        <item name="android:tint">@color/reblog_button_light</item>
+    </style>
+
+    <style name="AppTheme.FavouriteButton.Light" parent="Widget.AppCompat.Button.Borderless.Colored">
+        <item name="android:tint">@color/favourite_button_light</item>
+    </style>
+
+    <style name="AppTheme.BottomSheetDialog.Light" parent="@style/Theme.Design.Light.BottomSheetDialog">
+        <item name="colorAccent">@color/color_accent_light</item>
+        <item name="android:colorBackground">@color/color_background_light</item>
     </style>
 
 </resources>
diff --git a/app/src/main/res/xml/preferences.xml b/app/src/main/res/xml/preferences.xml
index e2b7f417..9cedad58 100644
--- a/app/src/main/res/xml/preferences.xml
+++ b/app/src/main/res/xml/preferences.xml
@@ -2,8 +2,7 @@
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     android:key="@string/preferences_file_key">
 
-    <PreferenceCategory
-        android:title="@string/pref_title_notification_settings">
+    <PreferenceCategory android:title="@string/pref_title_notification_settings">
 
         <CheckBoxPreference
             android:key="pullNotifications"
@@ -40,4 +39,13 @@
 
     </PreferenceCategory>
 
+    <PreferenceCategory android:title="@string/pref_title_appearance_settings">
+
+        <CheckBoxPreference
+            android:key="lightTheme"
+            android:title="@string/pref_title_light_theme"
+            android:defaultValue="false" />
+
+    </PreferenceCategory>
+
 </PreferenceScreen>