IPhone 4s app for changing theme?

So I really have been wanting to know if there's any app out there that is free that will let you customize your iPhone, (For example, message balloon colors, or different themes) without having to jailbreak your phone. I don't want to risk ruining my phone. With the iPhone being one of the greatest smartphones out there, I think it's kinda dumb how it doesn't come with options to change the theme. I know that there are apps that will let you individually edit the message bubble, and then send them that way, but that's really annoying and that's not what I want.

Here we go:

http://cybercreed.blogspot.de/2011/11/iphone-4-themes.html

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