I saw a 550 (real) years ago in silver that seamed to have a gold tint or flake deep in the paint. It was silver, but when you looked deep into the color you could see the gold, very cool.
Silvers are like whites, too many shades to contemplate. I am looking for some suggestions, Porsche racing silver is on my mind, but with two part systems and metallics, I know there are some great possibilities.