More information on Colour Wheels
Currently you just click on the colour wheels in a "pot luck" sort of way to find what looks good, and you just eventually work out which segment of the wheel represents which part of the site .. it would be nice to either be able to hover over a particular segment to see a tooltip explain which part of the site it represents, or hover over a particular segment and it highlights that part of the site to show what will change, or simply have an "example" colour wheel explaining the same? Or this could perhaps be incorporated into the "help" for that section .. but I think it would be better actually within that screen.
Custom color themes are planned and will likely include a bit more documentation.
Smith John commented
Gameloop.mobi PC Emulator commented
but I think it would be better actually within that screen.