Sick of fingerprints all over your old iPhone, or sporting a seriously scratched-up model? A DIY brushed finish won't completely eliminate the fingerprint issue, but it will give your phone a notably different look.
The Base Jewellery Blog includes a step-by-step guide to creating the brushed finish, which requires dismantling the phone and essentially attacking the case with sandpaper. Naturally, that's not going to go down well with Apple -- but if you're out of warranty, there's not much to lose.
Giving the iPhone 3G a brushed finish [Base Jewellery]