Where is Henna Magick?

So I've been interested in researching how Henna has been used in magick and ritual but I haven't been able to find any books or sites or anything on the subject.
My first reaction is...well if I can't find any books, why not make one instead. (make anyone think of the Grinch much?)
If you can find rites, spels, workings that use Henna I would appreciate the aid.
Also, if you would like to help out, come get some henna tats or if you are working a rite and think a henna tat would help then give me a hollar.
Thanks and Blessings,
Dawn