More to explore:
Figure to Abstraction
LICHTENSTEIN INSPIRED PORTRAITS by heidabjorg, via Flickr
What would you keep in a jar? Art project for any age. Make "how to draw jar" sheet for sub perhaps. Be creative. Use your imagination.
Zentangles for kids
could be a fun project idea...
Op Art Cubes. Decorate them as 2D designs & see how they appear to change when folded into boxes.