Springtomize - Tear down the walls
Five Icon Switcher - This puts more icons into the iOS4 multitasking bar, instead of the usual four.
Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
Iconoclasm - Iconoclasm is a tweak that lets you break the barriers of what you can do with the app icons of...
Dreamboard - DreamBoard lets you take control over the homescreen of your jailbroken iPhone.
SwitcherMod - SwitcherMod lets you customize the iOS4 multitasking bar.