As tattoos continue their growth in mainstream acceptance, the envelope for artistry and complexity keeps getting pushed further. Amazing use of color, increased detail and 3-dimensional texturing have really helped to enhance the perceptions of tattoos as a true form of artistic expression.
One of the newer developments in this arena has been the advent of the UV tattoo (also called a blacklight tattoo). Using specialized inks that are visible under only ultraviolet light, these types of tattoos add a brand new dimension to how people choose to express themselves on their human canvas.
They can also allow people to embrace body art in a much more subtle way. In some cases, a person may want to have a nice tattoo, but not have it visible at all times. A U.V. tattoo is perfect in that regard because it allows them to get inked but only show it under special circumstances (this chemical compound design is an example)
Decepticon and Autobot logos:
Angel wings on back: