Any colours found in a Baha'i symbol would be arbitrary choices of the artist. The Baha'i Faith has no standard "colours" such as those you might find in a flag.
The literal translation of the Persian/Arabic word Baha'i means "follower of the glory (of God)". Baha is "glory" and the 'i is "follower of." Baha'is believe that throughout the history of mankind,...