Miyla is a nice theme designed for iPhone 4, iPod Touch 4 and SD Devices running 4.2.1 firmware.
Miyla provides all stock icons themed, a few icon Alts and some popular appstore icons themed (Apply SummerBoard mode to use these), LockScreen and HomeScreen Wallpaper are in the theme folder. (Wallpapers ending in SD for legacy users, Also in the theme folder)
To apply FolderSwitcherBG you need to delete the `FolderSwitcherLinen0` to `3` in var/mobile/Library/Caches.