A few examples of Java applets customized by Laurie Garo on cartographic color theory:

Main module:  http://www.uncc.edu/lagaro/cwg/color/index.html

Additive colors, go to section II. A. in:  http://www.uncc.edu/lagaro/cwg/color/intro_color.html

Color Chart Systems, go to section II. E. in:  http://www.uncc.edu/lagaro/cwg/color/color_mixing.html

Color Combinations, go to section 2. Color Combinations:   http://www.uncc.edu/lagaro/cwg/color/color_percept.html