Villains in Color

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First attempts to throw some colors on my super-villains. The challenge is to make them work on their own, as a group, and when they clash against the good guys. Since the heroes have a base color of blue, with yellow accents, (see below) I tried to do the opposite with these guys, but also had to add some other colors, mostly green, (traditionally an "evil" color) so they don't look like they are related to the good.