I loved doing this in art class. Art With Mr. E: Line Design w/Shading - Grade Very cool, fun art shading project from Art With Mr. E. he's an elementary art specialist. Try this with your kids (but I think grown ups would enjoy this too).
do on small plates for dot day Collaborative HAND ART project. Could be done with a classroom of students. Or make it a family project and have children collect one hand print design from each family member, then put them together for a family tree.