This was sent to me by Danish blogger/art teacher, Tina Kejlberg. She has lots of tutorials on her site, many of which you can adapt for a sub. Google has a translation option that pops up to translate the site for you. Go take a look! Mrs. Fine - glimpses from my art education.
Draw the Other Half Art Worksheet - Middle School Art Sub Plan
Thanks so much, Jessica, for sending along this sub lesson. She uses it as a time fill if she needs to, but says that you could also leave it as a sub plan. Jessica says "if anyone wants me to send them the original in an email, to comment on my post :) " Check out her sub lesson on her blog, "Miss Young's Art Room."