The 50's was a time of interior/exterior color cordination for the auto industry. Changing from the original colors on those cars throws off the balance. The modern metallic's, pearls and transucent paints really don't work on them.
As popular as the two tones, (and even tri tones), were then I have seen several mono tone 55-56 Chryslers. There was a beautiful dark green 56 at Carlisle.