Minneapolis Institute of Arts
Arts Connect Ed Artist's Toolkit Encyclopedia: Color
An interactive site that explores the elements and principles of visual art through the artist's toolkit. This lesson is from the artist's encyclopedia entry for color and includes information on the color wheel, value, mood, natural...
Space Telescope Science Institute
Hubble Site: Behind the Pictures
At this site from HubbleSite, you can take a peek behind the scenes and discover the meaning of color in Hubble Images.