I'm dying - I am having the same problem and I can't decide what sort of color combo I like. Right now, my interior is all palomino, parchment, and other versions of beige...it's gross. It looks like a Ford Aerostar.
My exterior is Red (debating keeping it or painting it - dark blue or black). It has the gold GT350H stripes on the side; stickers which I'm going to have removed.
I do not one a monochromatic interior. I also don't want white. I cannot seem to formulate a color combo that doesn't look tacky, but will also match my car. I'm pretty sure I want red TMI R seats. But I'm not sure what to do with the carpet (they are still in pretty good shape), dashboard, dash panel (paint is pretty smooth), doors (chipped paint), door panels (worn), and the interior side panels (which are totally trashed and have to be replaced).
I sort of like the black and red, but i have yet to see a combo that I like.
I like the black and white posted above, but this will be a daily driver so that's why I don't want white. Plus my kids are, well, kids.
As for the exterior - does anyone have any unique paint schemes that they like? Striping? This is an A code originally, but has had a bunch of stuff done in the Shelby shop so I sort of want to honor that, but not go full GT350 clone.