Jailbreaking is awesome. Get themes and apply them, there are things that give free in-app-purchases and free apps. Piracy? It's legal according to Apple.
lmfao not it's not, enjoy your ban. jailbreaking is legal. piracy, in any form, is still illegal.
anyway OP, you can do a whole bunch of cool stuff like apply themes, modify how the device behaves, and a ton of other things. for instance, look on Cydia for an app called "Infinifolders." it allows you to have more than 12 apps in a folder. also, look up "Springtomize" for more springboard customization that you'll know what to do with.
oh, also look up Winterboard, iFile, and Insomnia. Winterboard allows you to change themes, iFile is like windows explorer for an iOS device, and Insomnia keeps your device connected to wi-fi even when it's asleep.