How to decorate iphone apps?

I want to decorate my iPhone apps without jail breakin though. I tried an app called cocoppa but i don't like how it doesn't take the place of the app. When you click it it just takes you back to the cocoppa app -.- so please help!

Other than that, you can't customize anything on a IOS device other than the wallpaper.
Android allows you to customize just about everything on the device.

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