Check out this Benjamin Moore site. And yes, I know they don't make automotive finishes. This site allows you to test color combos to see how they look together.
Let's say that you plan to paint the C4 purple with a black stripe and silver wheels. You can bring these colors up and paint your virtual house to see how the different hues look together. You will have to use your imagination to see how it looks on a Corvette though.
I painted my virtual house in the despised Green Bay Packer colors and it looked hideous
http://www.benjaminmoore.com/wrapper...proj&N=intproj

 

I can't believe the Detroit Lions colours are any more attractive...

Loosing Blue and Horrid White are not a nice combo to me. Don't forget the Matt Melon trim.