It has been found that blue can decrease the heart rate and have a calming effect, but once again, only in moderation. Overexposure showed to have the opposite effect.
Some color studies have shown that blue/green makes you eat slower while yellow/orange/red makes you eat faster and more. (Ever notice the colors inside a fast food restaurant?)
As far as personality types and their optimal environmental colors, studies have shown that extroverts do better surrounded by brighter colors and monochromatic colors tend to agitate them. The opposite was found true for introverts.
Along the same line, some have concluded that the combination black-red can provoke aggression, black-yellow self-destructive choices, black-green egocentric behavior, and that black-white can precipitate neurotic decisions. (This particular study was done for a large store chain looking to curb shoplifting via color influence by use of interior design.)
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