Apparently temporary tooth tattoos/decals are popular in Japan now!
via Japan Trends
Kind of a light and trendy version of body modification. Here's the other end of the spectrum:
via Sun Times
Donut/bagel head. A few years ago, people started filling their heads up with saline to make these crazy shapes! It gets absorbed by your body after a few hours so it's not permanent. Vice just did a piece on it a few months ago so there are tons more pics on the web now, if you are so inclined.
BTW I think I should go to Japan to be a model, because they love the H-Asians (half Asians)!