There are a couple of gold cars floating around out there too, and I'm sure we've seen the diamond-covered SL. Here's an M5 (gold wrap):
This 911 is covered completely in 18 karat gold. There are a few nicer cars which have received this treatment (that one Veyron, an R8, a couple of AMG Mercedes and Ferraris) but this one stands out due to engraving and tooling on the plate:
