This is a cycles shader node that looks like a metallic paint or car paint. It includes 12 colors.
The model has been made by Robin Marin (tuqueque). You can find it in "http://blenderartists.org/forum/showthread.php?151903-b.m.p.s.-1.5!" It was created to test materials and has been adapted it to work with cycles. It is a CC-BY lincensed blend.
*EDIT: I have tested this shader with a hdri background, and it results too much clear. Reducing multiply factor inside the node to 1.2 can help you to get a good effect.