I had never heard of zentangles until recently....to me it was doodling! (and doodling it will remain!) But it turned out to be a great project to do in between bigger and messier projects.
Each student got a 'quarter' to complete and then we created a display of circles. A great way to do a group project where each student still gets to take their own work home.
After some feedback (thanks Phyl), Ive decided to call these zen-doodles!