Red can denote boldness, aggressiveness, and extrovertedness, but it also represents anger, danger, sin, and blood. i like yellow but yellow is known as a fast color and is the first color to register in the brain. Yellow causes you to be alert and watchful, and you want them to relax and feel comfortable....
so id say do something with green. It is the easiest color on the eye. It is a calming, refreshing color. People waiting to appear on TV sit in "green rooms" to relax. Hospitals often use green because it relaxes patients. Dark green is masculine, conservative, and implies wealth.