Gridlock 2.0 was released just moments ago, and it brings iOS 6.x support in tow. Gridlock is a tweak that's very popular among jailbreakers, because it gives users the ability to rearrange their app icons using a simple drag and drop action.
Normally, iOS prevents users from organizing app icons in any way but in a linear manner. With Gridlock, you can easily leave blank spaces between app icons. In my opinion, Gridlock is best served when mixed with iOS themes, and jailbreak widgets like Dashboard X. Whatever the case may be, you'll likely enjoy the sense of freedom that you get from using Gridlock.