Quoted from nosro:If you are like me and failed art class, here's a color wheel. A contrasting color is on the opposite side of the wheel. Therefore, a color that contrasts well with blue is orange and a color that contrasts well with red is green. The ultimate contrasting color setup might be to have orange on the bottom, but green on the upper flipper (since it is near a lot of red)
Damn you man, you brought logic into this conversation.