In LW there was a really nice color picker that had the option of displaying several types of color combos, complementary, triadic, quadratic, etc. That was nice. (IIRC, it was based on something called the ‘Jupiter’ color picker.) Also it had swatches built-in.
For triadic, for example, it had a 3 way cursor, like the Mercedes logo, with which you could see the, err, ‘triangular complements’, or whatever they’re called.
Anything like that for Blender?