I just don't know how to execute it

Here's the idea, as you can see. Yes, I have an iPhone 5C. Yes, it's a cheaply built iPhone 5. But I got it for free by my insurance company, so I can't complain (it was either this or an 8GB 4S). And yes, It's a 5 minute Photoshop and the whole concept needs developing.

Since I got the phone I have this idea of making a Gulf livery for it, but I can't find a way to make it fit right because of the rounded corners. So, it wouldn't be just print out a sticker, it'd need to fit around the phone.

Any ideas?