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).
Toilet roll dolls with changing faces. For teaching moods or expressions. Or for Purim to put different expressions on the characters faces - Haman happy, sad, angry scared etc. or put kids faces inside!