GroovyLock allows you to apply themes to the iOS 7 LockScreen

  GroovyLock is a plugin released last night in Cydia, and with its help we can apply various themes for the LockScreens of running iDevices iOS 7. The plugin works with themes designed by the developers, but also those designed by other people, the entire LockScreen being modified according to the way the developers design their packages, the plugin being able to modify any aspect of the screen.

GroovyLock is a HTML LockScreen MobileSubstrate theming platform for iOS 7, on all devices. Themes are loaded from /User/Library/GroovyLock/ and it looks for ThemeFolder/LockBackground.html.

  GroovyLock it is available for free in the repo ModMyi al Cydia.