In the event that you're not happy with Apple's bland white system-wide user interface color, a new jailbreak tweak called UIColors
by iOS developer Bailey Seymour is now available that will let you colorize iOS 7 system-wide to your liking. The tweak will colorize main user interfaces, sliders, text color, keyboards, threads, both third-party and pre-installed apps, and more.
As shown above, UIColors will let you color almost anything that has to do with iOS. The tweak is very user-friendly, giving the user an infinite scope of color options that can easily be applied with a respring.
To configure the tweak to your liking, you'll want to head over to the tweak's preferences pane in the Settings application, which is shown below:
The first pane you'll see if a place to disable the tweak to individual applications. By default, the tweak is applied to every application, but if you experience a situation where an application doesn't really play nicely with the tweak, this is one way to combat the problem. You'll also find a pane for selecting a primary color (this is applied to the whole user interface), a pane for selecting a secondary color (this is applied to switches, sliders, and other minor user interface elements), and a pane for selecting your text color.
You will also find two switches, one that enables or disables coloring iOS and SpringBoard, and one that enables or disables the tweak on demand. There's also a respring button at the bottom of the preferences pane under the developer contact information that you can use to respring your device each time you make changes.
The colors are selected with a color picker, as well as hue, saturation, and brightness sliders:
UIColors is very in-depth, and will be useful for all of your colorization needs. On the other hand, it does have some rough edges – it doesn't look good to have colors everywhere, but it looks good in many applications. If you want to give the tweak a try, it's available for $1.49 in Cydia's BigBoss repository. The tweak does require iOS 7 to be installed.
iPhone 5 running iOS 7.0.4