This tool is based on the ColorMatch 5K tool. My goal was to make it work in any modern browser (IE5+, NS6+, Mozilla).
This utility will help you select a matching 6-color palette for your website.
Define a single color that you like. Matching colors will be calculated.
Click on any of the colors in the row to make it the primary color.

I like this color:
6-color matching palette: