Colors, colors...

Alright, been brainstorming a bit... now I'm not very inclined to color theory unfortunately, so I have come to ask for your help brothers...

Here is a few sample shots of the color palette I am going for. My intentions all along were to have a maroon-ish armor base color, with gold trim and detail within the ornate pieces, such as the logos and bordering. I like the armor base color personally, but where I'm stuck is the cape and the underlying body color. For the cape, I initially wanted to go with the traditional purple(since that was sort of Shredders staple in the cartoons).. but after applying it, I can't help but think that it doesn't contrast the maroon very well at all. I tried several shades and opacity settings, but did not get anything worth much.

And the underlying color, although it is black(black is supposed to contrast everything, right? lol), doesn't seem like it fits either.

I am very unsure about this whole color scheme, though I am pretty much dead set on keeping the maroon base for the armor. So I ask, what are your suggestions for some colors that would contrast it well?

*Remember, this is flat, base colors on the model. No detail whatsoever yet, I am just trying to put a palette together to build from**

Here are some shots.