Colors can stand for a variety of emotions and principles. For instance, red is associated with romantic love and passion. The color can also be a symbol for willpower and anger.
Yellow is the color of energy, joy and intellect. The color prompts mental activity and stimulates muscle energy. Green symbolizes growth and fertility. Dark green is associated with ambition, jealousy and greed. Olive green is traditionally associated with peace. Blue denotes trust and loyalty. It is also the color associated with heaven, since the sky is blue. Purple is the color of royalty. Light purple is a symbol of nostalgia and romance, and deep purple can be a sign of frustration or sadness.