There should be an option to mix chromas if you own multiple for 1 skin. An example would be the new Battle Professor Graves skin. His hair changes color, his clothes change color, and his gun changes color. If I own a chroma where his hair is black and one where his hair is white, I should be able to choose which hair color I want. Obviously this wouldn't work for all skins with chromas (Like Zac who is primarily 1 color), but It would be a cool new feature that would definitely sell more Chromas.