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).
This is insanely clever and I imagine loads of fun! Who does not like popping bubble wrap first off, and then add paint = deal! - Bubble Wrap Stomp Painting - make some bubble wrap "boots" then dip in paint and stomp around to create art!