Just the title of the post say: Chroma jailbreak tweak allows users to customize system-wide tint color in iOS with an unlimited range of colors. In other words, there’s no limited color combinations, the end result depends totally upon you and your choice. Once you choose a color, it will be applied to many different user interface elements across all applications such as the buttons in App Store’s navigation bar, chat bubbles in the Messages app etc…
After installing tweak on your device, go to the tweak’s settings preference where you will be able to enable or disable the tweak. You can also customize the dark tint or the light tint color by dragging around the slider on the RGB board to select a color of your choice.
Once you choose the color you like, all what you have to do is just killing all of the apps from the App Switcher and after it you will find the effect of Chroma appear… No respring is required.
If you want to give a new look to your iOS device, you should give Chroma a try. It is available in Cydia’s ModMyi repo for free and is compatible with all iOS 7 devices.