Blue is the coolest color - the color of the sky, ocean, sleep, twilight. The ancient Egyptians used lapis lazuli to represent heaven. Blue symbolizes the Virgin Mary. A pure blue is the color of inspiration, sincerity and spirituality. Blue is often the chosen color by conservative people. Blue is the calming color. That makes it a wonderful color to use in the home, especially for babies. Blue is so soothing that is a good choice for pajamas. Dark blue is the color of truth and moderation. A blue iris means your friendship is very important to me. Wednesday's color is blue.