Whether you're using the Android Developer methods to hard-code styles or just grabbing a cool icon pack from the store, theming is the best way to make your tech feel personal. Styles and themes | Views - Android Developers
The Ultimate Guide to Android Themes: Beyond the Basic APK Download
Most third-party themes require a "Launcher" (like Nova, Apex, or ZenUI) to function. 2. Top Methods to Transform Your Interface