This is a theme for stock for pure AOSP roms with xTheme Engine
Its purpose is to enhance the Android UI without compromising the vanilla look.
If you have a ROM like Cyanogenmod & co. download the version for theme chooser.
For more info ...Plus
If the theme is not showing up in Xposed: -Backup the app to your sdcard using your favorite app (Romtoolbox): -Go into app manager -Find the theme app -Select it -Back it up to sdcard -Select the app again -Uninstall the app -Go to sdcard under app_manager -Into App_Backups -Select the Theme and install it -Go back into xposed and the theme will be there