My own hand, this was the first time I attempted the toilet paper wrapping and... IT WORKED! I should have never doubted all those internet peoples. The TP sticks perfectly to the sticky dry henna and seemed perfectly content just stay there. I even did some designs on my feet which, after the henna dried, remained pretty crisp. It was also nice to not wake up with henna bits all in my socks and my bed. That's kinda gross.
I did these on my mum while visiting over the weekend. As expected, I'm going to need to figure out how to restrain her from smudging all the fresh work!