My son hennaed his feet this morning with a blue pen.
My first impulse was to scrub it off. He didn't like that idea (Owww momma! No No No!!!). So I decided that it really wasn't a big deal...in fact, I was amused that he found it so entertaining to color his feet that way, and not the rest of his body. I also decided that better his feet, and not his little cheeks...His sister hennaed her face with yellow, green, and blue marker one day while in daycare a few years ago. She looked pretty scary, actually, and reminded me of Darth Maul from Star Wars...seriously! It took 2 days for the ink to wear off (washable my ***!)
I forgot to take a picture of his feet before his bath, so please excuse the faded pen on his cute little feet, and imagine the ink darker and more of it:
So there you have it - blue henna!