Is there a safer alternative to jailbreaking iPod touch 4G?

When I say alternative, I mean an Apple approved one. I read somewhere that Apple had created an alternative that is safer and doesn't void the warranty. And, the main reason I'd want to jailbreak my iPod is to get themes, so is there a way I can get themes for my iPod for free? Not wallpapers, but actual interactive themes. And, if it matters, it is running on iOS 4.2.1.
 
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