English 680V: Visual Rhetoric in a Technological Age (Purdue)

http://wellstyled.com/tools/colorscheme2/index-en.html

Pick a color, pick the type of variation, pick the angle of variation, pick a color style.

Finally, you can also pick to see it according to various levels of color blindness (complete with percentage of the population who will see your color in that way)

Way cool.

And check out the root. As near as I can tell, it's a Czech compan