oh look, some noob in the art dept has discovered that the in-game shaders let you play silly beggars with the specular maps. Try a real challenge - a black paint job with a starlings-wing iridescence that doesn't look dreadful. Hint: Feed a fractal into the specular tint channels to get the right iridescence color profile and then get the specular exponent, the fresnel factor and the response to ambient exactly right or it will look like you drew it with crayons. Have fun.
A good iridescent paint job would be most welcome or maybe something like a cuttlefish 'passing cloud' effect [video=youtube;l1T4ZgkCuiM]https://www.youtube.com/watch?v=l1T4ZgkCuiM[/video]