[ame=http://www.youtube.com/watch?v=H51tWsdt310]YouTube - SHRINK, BIGIFY, AND ROTATE ICONS ON iPhone And iPod Touch - iOS Vlog 367[/ame]
Bigify is a great tweak to add to your device. Before there was a tweak called Shrink that did almost the same thing, but from personal use, there were problems with it. Bigify will allow you to shrink, enlarge, and fade your icons on your homescreen. Believe me, with a simple tilt of an icon, there is almost no need for themes. You can also make them small to add more apps in a row or larger and make your screen a giant clusterf**k of icons. Either way, the tweak runs pretty smooth and tapping your icons, even when their size has changed is very responsive. Check out Bigify for the great price of FREE in Cydia.