I think I managed to solve the cold warm dilemma. I took the dark green (which was relatively unused and rather dull as far as ramping goes) and made it a complimentary to the other dark I had (aside from the darkest cold). Now I can dither those to get a dark grey-ish color if I need one.
So:
- Really Dark Cold for vague non-interfering background details on black.
- Dark Cyan which works with the green and blues or as a cold dark gray, and as a dark background tree line color too I suppose (dark green with a blue-grey atmospheric tone).
- Dark Brown which works with the red-browns. Can, along with the colr above, provide interesting temperature variations in the darks.
Most colors can build on those. I might still nudge them around some more, but the theory is sound I think.
I also did some minor changes to other colors. I need to do more mockups to see if I'm really on to something here though.
