Keith Graves' book "Monsterator" will get your students excited about exquisite corpse. It could be done as a follow up to a portrait unit, or as a stand alone. I'd like to bind each class set together into an album. There are not many lessons I can say this for, but I truly believe you could go 1st-12th grade with this and it would still be relevant and enjoyable.
It could be a great fall "sub lesson" for middle - high school. Teachers could create a worksheet like the one I'm including with the lesson plan over on TpT to simplify the measuring for the younger students. And when they're done? Why not let them play a game?