Springtomize - Tear down the walls
Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
Dreamboard - DreamBoard lets you take control over the homescreen of your jailbroken iPhone.
Infiniboard - Vertically scroll your home screen pages!
Cylinder - Sexy homescreen icon animations
Six Icon Dock - This tweak allows you to have 6 icons in the dock of your jailbroken iPhone.