Use colours that are almost identical
Because that way, they'll match, right?

Similar colours for both text and background are a BAD IDEA. If you can't figure out why, we likely can't help you any more beyond this.

Any luck reading that? Didn't think so. While the theory may be that you end up with something pleasant looking and easy on the eyes, the reality is one big headache. Literally.

Use as few colours as possible and keep it easy on the eyes. People won't come back if you're giving them a nasty case of astigmatism...