That's so cute! Love it when kids wanna do what you're doing.
Once when I was babysitting, the kids wanted to watch a movie. So, I did what I usually do when watching TV, pulled out a hand-quilting project. They were appalled when I stuck a pin into the arm of their couch. "You wouldn't want somebody to stick a hole into you, would you?" I showed them that the couch wasn't hurt and the hole just closes right up, and they spent an hour or more making patterns with my extra pins in the arm of the couch. I had the ones with the round colored tops, so they made little faces, flowers, and such. (They were 6 and 10 at the time and well supervised so they didn't hurt themselves, BTW.)