i had colorware paint an old 4g ipod a few years ago. while i was pleased with the results it was too expensive then, and the iphone is more than double what they charged for ipods. so no, i'm not going that route. two, i already have the black housing and everything transferred from the silver with the exception of the metal side slats.
warranty's are nice and all, but if something breaks, i just buy a new one, i typically don't mess with warranties.
i was more looking for a good way to remove the glue. i planned on using superglue to reinstall everything, but the problem is getting the stuff OFF the original backing. apple used friggin cement on this thing!