PandaHome Home replacement app for Android.

PandaHome is by far the best home replacement app for Android. Having several options to tweak settings, either by going to the Theme settings options from the menu button, or by long pressing on the screen and choose Home Assistant, or by installing the widget PandaHome Toogle.
You could change font size and color, background color, wallpapers, Multi-screen, Themes, Drawer settings, Dockbar settings, picking automatic randomized themes, etc.