You'd be suprised, Desert Rat, you'd be suprised.
Companies painted parts whatever colors they had, be it dark dull green, bell green, bronze green, zinc chromate yellow, zinc chromate green, interior green, olive drab, or aluminum lacquer. And it wasn't just one company that built a plane. The pieces parts came from EVERYWHERE!!! It's quite common to see different colors in a SINGLE plane (Maybe an interior green cockpit, bronze green seats, zinc chromate green radio room, zinc chromate yellow gunner compartment, and aluminum lacquer bomb bays. That's a lot of color.) Pretty much any combo works... the best bet is to read up that IPMS Stockholm article to get a general idea.