What is a good app to customize your screen on an iphone 4s?

So many people have found an app to customize their screen and apps. But when i ask them they won't tell me. So if you know please tell, thank you. P. S. Is it only for the iphone 5?

To make their apps look different?
it's easy
download the app
Cocoppa

it has instructions there. Just be sure not to delete your original apps, bc the "apps" on their are just links to the original.