Springtomize - Tear down the walls
Cydia - An alternative app store for jailbroken devices.
Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
Zestia - Zestia is a mobile app designed to assist you in organizing your hectic schedule, social life, and professional persona.
Dreamboard - DreamBoard lets you take control over the homescreen of your jailbroken iPhone.
JazzMyApp - Let JazzMyApp surprise you with amazing apps everyday. Try it out yourself.