Color Scheme Designer

Its a color wheel on the left side, select a base color (I used a six digit number). Then along the top choose color relationships to it (i.e. complement, triad, etc). Then on the right your four colors and a sample shows up of what a page might look like. There's also a fun tool for which color blindness's and what the colors look like to those people. Lastly in the lower right is a "light website" and a "dark" one that are populated with representation of your color palette. http://colorschemedesigner.com/