A cardboard beard that's long and scraggly......
This project is similar to the cardboard mustache, except that you're gluing cardboard fringe onto a base. I used a rubber band threaded through two holes on the sides of the beard to secure the beard to the face.
A few costume options:
Gnome: add gnome hat
Uncle Sam: add patriotic top hat
Santa on Vacation (hey, it's Halloween!): add mustache and red or green track suit
Dr. Weil: add bald cap and mug of green tea