When creating bulletin boards of any kind, let the kids in your classroom do the work for you, and let them help you out. It gives them a great sense of ownership and pride within the classroom to see it displayed. For a bulletin board that is tree shaped, one would cut the trunk of the tree from brown bulletin board paper. In order to create the leaves, have the students in the classroom trace their hands on bulletin paper and have them color the hands in a wide variety of fall colors. Such colors are red, yellow, orange, brown, ect.