2x2 Folder Icons is the perfect way to make your folders icons display 2x2 thumbnail icons instead of the typical 3x3. Why? Because you might have a few things you don't want to show in your folders at first glance or you have ayecon installed, and in which case, with smaller icons than stock iOS so it fits much better.
Works only with iPhone and iPod touch.
View Settings.app to toggle tweak.