Red is the color of fire and blood, red holds associations with danger, power and strength as well as love and passion. Red is seen everywhere as a symbol of love, as is proof by Valentines day decor.
Red is a very emotionally intense color, physically, red excites the viewer. It has very high visibility, which is why stop signs, stoplights, and fire equipment are usually painted red. In heraldry, red is used to indicate courage.
Variations on red and what they mean:
Light red represents joy, sexuality, passion, sensitivity, and love.
Pink signifies romance, love, and friendship. It denotes feminine qualities and passiveness.
Dark red is associated with vigor, willpower, rage, anger, leadership, courage, longing, malice, and wrath.
Brown suggests stability and denotes masculine qualities.
Reddish-brown is associated with harvest and fall.