Cut as many leaves out of autumn-colored papers as you have guests. Ask each person to write down what they are thankful for, and place them on the tree or in a basket or bowl on the dinner table. If you have one of those little wrought iron trees that you can set on your Thanksgiving table, this will make a beautiful centerpiece. Tie little ribbons through a hole in the top of each leaf, so they can be hung on your "Thankful Tree." Take turns reading them as you enjoy dessert, then collage them into a Thanksgiving album as an after dinner activity.