I loved this project!  I took some corrugated cardboard and cut it into an approximate 5x7 size.  Then I glued a string at the top for hanging.  I painted both sides and am now using it as a sign on my studio door warning others that I am in the process of filming.  It's really handy!!!  I'll save the other side for another fun message later on.  Thanks for the class Peggy.  : )