Don Davis is a space artist who takes the question of color in space very seriously. So I was very happy to get an email from him a few weeks ago, telling me that he had revamped and updated several pages on his website pertaining to colors in space. Rather than blather on about them, I'll just invite you to go read:
Also note his excellent work creating "true color" images from Mars Odyssey THEMIS data: #1 - #2 - #3 - #4 - #5 - #6 - #7 - #8 - #9 - #10 - and four earlier ones: 14-Nov-03, 3-Dec-03, 26-Dec-03, and 10-Jun-04)
And finally, a really valuable page that attempts to debunk the myths and conspiracy theories that circulate about the meaning of the colors of Mars: On controversies concerning the colors of Mars and the evidence for life there.