GO Locker - GO Locker,design to GO Launcher EX is the most simple locker for Android!
Lockinfo - You can find this app in Cydia - Tweaks.
Artispoon Lock Screen - The app lets you secure your phone while you enjoy artworks of professional artists on your lock...
Dreamboard - DreamBoard lets you take control over the homescreen of your jailbroken iPhone.
Transparent Screen Lock - Password protect your workstation or server with "Transparent Screen Lock" while monitoring programs that are running.
Springtomize - Tear down the walls