Color Schemer

Does anyone know of an online tool where you can enter two or three different colors and it will generate you an entire pallette?

Most of the ones I have found have all been where you either pick from pre-generated schemes, or where you can enter just one single color and it will generate you a pallette. I want one where I can enter two or three of the primary colors I'm already using to come up with the best looking scheme.

Multiple colors would be almost impossible to make, considering the factors that go into developing a color scheme. But the below are some 1-color generators:

http://www.colorschemer.com/online.html
http://www.wellstyled.com/tools/colo.../index-en.html