So ArcaneWolf and some others were talking about how cool a metallic dk would be then some people said, but that's too similar to GaS DK. I think I have an idea that would be cool and different. :D
Instead of Metallic DK being a silvery type thing it could be like this:
If you use a metallic dye kit on a sepia pet it becomes a metallic sepia, on a cream it becomes metallic cream, etc. I'm not sure if it should work on natural though because different pet's natural colors are different colors, totally up to artist's though. :) What do you think?