Be complimentary

When designing websites, or anything else for that matter (scrapbook pages?), it's always more appealing when the colors used are the right ones. Once you have a primary focus for your page, the color scheme, a title or background graphic, etc, head on over to What's Its Color. Tell it where the image is (upload a local file or point it to an image on the web) and it will "evaluate an image and give you the image's primary and complementary dominant colors of an image, how many visually unique colors are in an image, and the top ten visually unique colors in an image."

Granted, this is mostly for web design, so the returned colors are only identified by Hex values, but a quick Google search will return English names for the colors as well.