Apart from selecting the toggles and shortcuts you use the most, Apple doesn’t provide a whole lot of customization for iOS’ Control Center interface out of the box. This is a particularly good example of how having a jailbreak can pay off.
A newly-released and free jailbreak tweak called Sareth by iOS developer iKilledAppl3 now allows users to colorize Control Center‘s module groups and configure a custom background image for the interface.