Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
Lockinfo - You can find this app in Cydia - Tweaks.
Five Icon Dock - Tweaks the dock of your jailbroken iPhone so that it can fit five icons instead of four.
Dreamboard - DreamBoard lets you take control over the homescreen of your jailbroken iPhone.
Cydia - An alternative app store for jailbroken devices.
vWallpaper - vWallpaper lets you set a video as your iPhone's wallpaper.