User blog comment:KittheCat/Nerin the Cat/@comment-1775303-20100101225658

for some reason the comment I posted before didn't show. According to my teacher and the color panel, which you can image google it up, the opposite of your selected color is the one directly across it. For example:

red's opposite is green yellow's opposite is violet.

By using this method you might find the colors you're looking for.