Colorize your badges! ColorBadges will modify badges based on the app icon colors. To increase contrast, ColorBadges will also add an outline around the badge.
ColorBadges will colorize folder badges based on the highest numbered badge inside the folder (or the first badge if none of them are numbered).
ColorBadges supports all iOS 7 devices including the iPhone, iPad, and iPod touch.
You can purchase the tweak for $0.99 from the Cydia Store.