It could be interesting.

In real life however... if I lost an arm and got a replacement... I would go the metallic look. Prosthetics, while getting more real... are just creepy to me. I figure people are going to stare anyways, might as well give them something cool to stare at... so I'd want gun metal, copper, silver... maybe even some lights? Mod that sucker out! Great place to store a USB port too. lol