"WinterBoard 0.9.3916 is now available, with updates for iOS 7 and 8 (for example: new support for theming the contents of Assets.car files)."
WinterBoard provides hooks that let graphics artists safely and simply theme almost anything in Apple's OS, including third party software downloaded from App Store. Multiple theme packages can be installed at once using the configuration interface: simply drag themes into a priority order.
What's New In This Version:
Version 0.9.3916 has been updated to support some new features of iOS 7 and 8 thanks to help from Surenix, thekirbylover, alexzielenski, coolstar, Matchstic, and JunesiPhone.
To enable, disable, or change the order of themes, see the WinterBoard panel in the Settingsapp: there is no standalone app as of version 0.9.3916.
Wallpaper (whether png, html, or any of the other crazy formats that I should never had added to WinterBoard is not currently supported on iOS 7/8 :(.
You can download WinterBoard from Cydia for free. If you haven't already jailbroken your device and are still on iOS 8.0 - iOS 8.1, you can find instructions on jailbreaking via the iClarified Jailbreak Wizard.