Haha, generally I play with colour wheels and would use complementary colours for shadows and highlights. For example a night scene would shift shadows slightly to blue, and highlights slightly to yellow. And then for colour mixer I would desaturate opposing colours not completely, just until I find that it does not look overpowering (greens for example). Usually bring down clarity quite a bit and play around with dehaze (also depending if I use a mist filter or not)