This file includes 6 node setups for carpaint with flakes shaders. It works for blender cycles.
Also it includes a simple test scene that uses a hdri environmet, because the "blender ball" did not show all the hues. The hdri file is not included. You can download that one and others from this link (it is studio30.exr). Besides the hdri file I have used a meshlight lamp to test specular reflections.
All node setups need to provide only one color. Changing that color you get another carpaint with flakes.
*Render images included.