Springtomize - Tear down the walls
Cylinder - Sexy homescreen icon animations
GO Locker - GO Locker,design to GO Launcher EX is the most simple locker for Android!
Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
Lockinfo - You can find this app in Cydia - Tweaks.
Transparent Screen Lock - Password protect your workstation or server with "Transparent Screen Lock" while monitoring programs that are running.