The below postcards encourage participants to think about who they are thankful for, and then to tell them! The postcards are already postmarked. At the open studio, there was a "mailbox" to drop into. I also have plans to go gorilla style outside of a Post Office or by a public mailbox (but it is really cold right now).

Top images are front & back (collage style).
Bottom images - a participant & a shot of some of the postcards filled out by participants 11/22.