colours also have an effect on mood. apparently a light pink was used for painting the walls of a certain mental hospital. the pink colour calmed the patients down. however, after elongated exposure to this light pink colour, the patients got frustrated and even angry. the mental hospital then painted the walls a light blue colour. this colour calmed the patients down and even after elongated exposure, the patients still remained calm.
P.S. notice the default colour scheme of Windows XP, coincidence?