A color commonly utilized to represent unity is blue. Different spiritual practices, and other types of traditions, utilize other colors to represent unity as well, including green and brown. Green and brown are used because of their association with the Earth.
The association of blue with unity arises from the belief that the hue represents peace and tranquility, which are necessary elements of unity. The color is also said to represent hope, loyalty and friendship, other foundational elements of unity. The flags of some nations, including Malaysia and the European Union, utilize blue to represent unity of the people of those countries.