What is xTheme Engine?
xTheme Engine allows you to theme your device similar to how T-Mobile/CM10 Theme Engine.
xTheme Engine is powered by Xposed Framework created by rovo89.
You will be prompted to install if you haven't.
Download and Install Xposed Installer from HERE
Install Xposed Framework ( from the xPosed Installer app )
Download and Install xTheme Engine from HERE
Activate the module in Xposed Installer app
Download and install theme
Apply through xTheme Engine App
-=WORKS BEST ON TOUCHWIZ ROMS=-