My friend just sent me this link to a color matching game called Color Method on the Smashing Color blog. I don't usually post about games but I think this is an interesting one as it will help in the understanding of color properties and harmonies.
Here are some links related to color:
Hue for the love of color
Color in Everyday Life
Choosing Color and Color Value for your quilts
Also check a previous post here for more stuff on colour.