Had my iPhone 4S color swapped at colormyi.com. They make you send it in, but they did great work...fast too. They don't sell the DIY kits, but then again, I don't really trust myself to take one of these things apart without screwing something up lol.
Wonder why Apple doesn't make the iPhone in color like they did with the iPod Nano. It came in nine different colors! I guess if they can't keep white in stock (remember the iPhone 4 launch?), then nine colors would probably be difficult.
Here are some pics of mine.
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