The ear tattoos is a rather unique tattoo location. Compared to other more subtle tattoo locations such as the ankle or small of the back, the ear tattoo is more often exposed, and has a rare combination of exposure and discretion.
How difficult a “canvas” this would be for the tattoo artist, but either way, it is quite easy to see how this could become a trend.
Some of the popular behind the ear tattoos for females are the astrological symbols, stars, birds, hearts, flowers, cartoons and butterflies. You can also consider to have someone's name permanently attached behind your ear to signify a close relationship.