One of the hardest things for those of us with limited color skills (or is it artistic skills?) is to get a nice set of colors for a site. We have many places we look when we want to find coordinating colors for example. However, one that I really like is this one that allows you to see a gradient of colors between two selected colors.
We also have a color tool on our site that we like to use. It isn’t our original work, however, we recently were able to make it partially functional in Firefox/Mozilla browsers, whereas it was not as originally written. The sliders aren’t draggable in Firefox/Mozilla. However you can click on the colored squares.
Web Save Color Slider at HTMLfixIT.com