The only thing that comes to mind, for us, is creating a DS themed after our favorite sports team and slapping a sticker on the top of the clamshell. And considering that we don't partake of the DS line-up of sports titles available, as we often favor the console variety, we can't really see that much appeal in giving the DS a splash of color.
But then we start thinking about what people with actual artistic ability could do with a professional paint job like this on their DS. True, most folks who mod their consoles and handhelds might prefer to do the painting themselves, as it all ties into the whole I made this part of it, but perhaps the time saved or price are the factors that could weigh heavily on someone's decision. Then again, we don't really know how much it would cost to paint something like a DS. Our skills lack.
Or maybe this can be a really expensive prank. Snatch a friend's DS, send it in and have them paint it puke green on top of puke green, that kind of thing? Actually, that might not be a bad way to get your own DS, because if our friend did that to us, we'd tell them to keep it.