Myoats is a community where people create designs using an online drawing application. These designs can be rated, downloaded, and archived. The Most Liked designs are rewarded by being featured on the home page. This may be of some use in a math class and in my design class with positive/negative space and printmaking with motifs. (It also reminds me of the old Spirograph toy I had as a kid)
And then there’s this. Try drawing a picture with sound. Your pitch and volume will determine the direction and thickness of the line. It’s rather difficult but kept me trying for approximately 25 minutes!