Do you want to be able to change the color of your folder icons on your Home Screen, or maybe even the label text of your folders? If your answer to these questions is yes, you should check out a new free jailbreak tweak called Folder Customizer
by iOS developer Brogan Miner.
With this tweak, you can adjust the background color and opacity of the folder icon itself, as well as the label underneath the folder icon. You can also adjust the color and opacity of the background behind the label, so there are actually three things altogether that this tweak lets you adjust.
When you change the background color of a folder, not only does the background color show up on your Home Screen, as shown above, but it also shows when you open the folder, as shown below:
After installing the tweak, you'll find a preferences pane in the Settings application where you can set your color options:
You can enable or disable each of the individual customization options on demand. Colors for each the individual items are set by the user with RGB sliders, and there is an alpha slider at the bottom of the options list that lets you adjust the alpha level. After every change you make, you'll need to respring your device for the changes to take effect.
If you want to give Folder Customizer a try, it's available for free in Cydia's BigBoss repository. The tweak requires iOS 7 and at this point in time, only supports 32-bit devices, not 64-bit iOS devices like the iPhone 5s.
iOS 7.0-7.0.4, 32-bit iOS device
iPhone 5 running iOS 7.0.4