Tattoos on your teeth! This detailed artwork is done in Utah by ToothArtist. There are many more examples on their site and details on how you can get your own tooth tattoos!
It can be a little pricey, but tattoos are permanent and a good tattoo is worth the price.
This is so fascinating and bizarre to me. I wish I still had my teeth from when I was younger. I would so get Chairy from Pee-wee’s Playhouse tattooed on a molar.