For those who are interested, henna paste is made from henna leaves which have been ground up into powder form and then mixed with lemon and usually an oil such as eucalyptus oil. The paste is then applied to the skin and left to dry. After about an hour (or longer if you can leave it on the skin) the dried paste is removed to reveal the pattern which has been dyed on to the skin. Since the paste is made from a leaf, it is safe to use on your skin (but always remember to check the ingredients and maybe do a patch test, especially if you have sensitive skin).
Here are some of the designs I have done for people:
Designs for Eid or parties
Henna tattoo on the back of the neck
Designs for an engagement party