Dead Unicorn

Unicorn tats are so horrible that only by tattooing a dead unicorn's head may he express his repulsion towards unicorn tats.

Chubby Rocker Girl

But for the clown/pig face, it would be just an ugly tattoo.

Che

This face is so ubiquitous that I thought it is impossible to screw it up. I guess I was wrong. 

Tiger-Butterfly

Oh my, what a beautiful tasteless design.

Killer Beaver

Fear the killer beaver