Mandala means circle or wheel in Sanskrit. Mandalas have been used for centuries by various cultures to aid in invoking prayer, for meditation, or to reflect emotions.
One Tradition of Wicca:
Earth - black
Air - white
Fire - red
Water - blue
Spirit - clear or silver
Another Tradition of Wicca:
Air - Yellow
Fire - Red
Water - Blue
Earth - Green
Spirit - White
Buddhism:
Earth - yellow
Air - black
Fire - red
Water - white
Void - blue
Pure Conscious - colorless, but since there is perfect
interpenetration of the six elements, it is present in each of the
five elements and prevades the paintings.