On any stock installation of iOS, every one of your notification badges are going to be red and contain white-colored text that usually indicates the number of missed notifications in the app. To me, that seems a little boring, and a developer named midey seems to agree, as he’s just released a new free jailbreak tweak called ColorMeBaddge.
With this tweak, you can colorize all of your Home screen’s notification badges in pretty much any way you choose, but the best feature is being able to automatically colorize your notification badges based on the dominant color of the application icon in question.