Shrink is a tweak released many months ago in Cydia, and its role is to allow us to change the sizes of the icons of the applications installed in our iDevices. The tweak has a settings menu available in the Settings application of iOS, and from there we can determine what the sizes of our icons will be, and depending on the size, the number of icons displayed in Springboard is automatically determined. The tweak allows changing the sizes of the icons in Springboard and Dock separately, so if you want to have different sizes for each of them, you can do so.
Shrink is compatible with iOS 6.x, and in Cydia you can find it in the repo in the tweak BigBoss of Cydia.
