Blue Devil Temporary Tattoo The blue devil tattoo is a symbol of historical significance as well as a phrase that is part of our everyday language. For instance the term "blues," as in moody, came from the phrase "blue devil." Blue Devils were a famous section of the French Army and a WWII American battalion was also called Blue Devils in the 1940s. From blue devil plants to the great music genre, "the Blues," this term has deep historical significance as well as use in pop culture. The little blue devil will promote your favorite devil sports team, help rally the community behind local issues and is, of course, and still a terrific Halloween icon.