On picnic day, my friends saw a bunch of sorority girls selling henna tattoos (Mehndi). We must have waited around in line (in the sun) an hour, and maybe 20 minutes more for them to get tattooed. I don't know what they were using for their dye, but it was most definitely homemade. I could have artfully smeared some mud on their arms in about 5 minutes. Same net result. At least they had fun!