Romero Britto Inspired Elementary Art ActivityThis lesson is from the Elements of the Artroom blog. Mrs. Stacey provides many examples from this second-grade art lesson. I believe an art sub could teach a lesson based on this.
Here is another 2nd or 3rd-grade art lesson about Romero Britto. This one is at The Talking Walls blog. There are plenty of instructions so you could easily translate this to an art sub lesson.
I could see this used for second through fifth grades.