I have come across a website that explores and explains the effects of colour in history and the relationship between the mind, body and colour. It shows the meanings of certain colours and the emotions they represent. Here is an excerpt.

Color in History

In ancient history, color was appreciated not for its abstract beauty or aesthetic appeal, but for the divine symbolism ascribed to it by various ancient religions. For example, ancient Egyptian magicians wore blue breastplates to represent the sacredness of their wisdom, and in ancient Greek poetry colors such as scarlet and purple were worn to represent the violent encounter in The Iliad and Ulysses wanderings in The Odyssey. Color and colored light has even been used in some cultures to heal various physical and mental ailments.

http://stress.lovetoknow.com/Colors_for_Relaxation see the rest here.