@pphilly: Henna is one of the most ancient cosmetics in the world, it's a natural dye, that comes from the Henna plant (lawsonia inermis). Henna has been used to create body art since very ancient times, and it's also used as a natural hair dye. You can find more info about this amazing plant on this post I've created a couple of months ago :What is Henna?... so yes, henna is more than just a non permanent tattoo.
I am a professional henna artist so if you ever have more questions about henna, I am happy to clear them out!
Cheers!