During the Roman Empire, Roman soldiers were required by law to have identifying tattoos on their hands in order to make it difficult to hide if they deserted.
Jessica Szohr ("Gossip Girl") doesn't comment on the tattoos on her feet - a cherub/angel-like character and some numbers on the top of her right foot and some letters on the outside of her left.
British model Jessica-Jane Clement celebrated her stint on "I'm A Celebrity, Get Me Out of Here" by having a lucky cat tattooed on her right leg. She also seems to have some sort of bird tattooed on her left leg.