The five elements of nature--earth, metal, water, wood, & fire--and their correlating colors, shapes, and significance:

Earth (yellow, tan, brown, squares) denotes relationships, integrity, values, loyalty, service, and health.

Metal (white, grey, metal colors, oval and rounds) denotes creativity, money, and focus.

Water (blue, black, wavy patterns) denotes new directions, business success, regeneration, spirituality, and communication.

Wood (green, rectangles) denotes long-term growth, vitality, prosperity, creativity, honoring customers, fitness, sales & profits, philanthropy, and receptivity.

Fire (red, pink, purple, triangles) denotes recognition, passion, and company vision. Use the Fire element sparingly as it also raises blood pressure.