Hmm, interesting approach Don't know if others feel the same, but more often than not, colors are strongly connected to what you are trying to achieve. What I mean is, someone might love electric blue over all other colors for some reason. That doesn't fit well to a historical medieval story that tries to be realistic. That is just me though.
Anyway! To actually answer your question.. I do have a few colors that I do like a lot. I can't really say favorite of any color, it is so context related to me. Crimson is one, passionate, strong, violent color. Various shades of natural green, peaceful, earthy, warm, somehow serene and calm.
Hope this helps a bit. If you don't mind, maybe sharing some info regarding your game? Setting especially since it is one of the most important things if not the most important thing when considering colors.