I have spent about 7 years painting color chips of Vallejo paints on white styrene plastic and then comparing them to the WWII naval color paint chip sets printed by Snyder and Short and many book references. It seems a lot of miniature painters like the Vallejo line of paints, and it is certainly extensive. This project started from a similar list I found on the Internet, but only had some of the Royal Navy colors. The link to the .pdf is below.
Added Regia Aeronautica. All major WWII Air Forces now included.