Have you ever been to the Behr website? Click
here, then click on "Start Color Smart." You have to be careful, because sometimes your monitor doesn't really display the right colors. But the tool will give you a collection of colors that coordinate with any other color you give it, and then you can go to a Home Depot and pull out the actual color swatches to look at.
As a starting point, for example, we have "Sweet Maple" on one wall in our livingroom. I was morally opposed to any yellow at first, but Mr. Clod convinced me with this particular shade, and he was right, I love it.