You can use a large thick sheet of styrofoam or cardboard in a pinch. This is especially fun when hanging children's creations having to do with the alphabet. Buy fabric pieces from a thrift store to use as a backdrop.
Selections are endless.
Great for a Fall border. I cover it with various colors of paper for bulletin boards and can add borders to make as many indiviual boards as I want. They have lots to choose from. The children seem to enjoy them too, and when it's time to make a new bulletin board, they are always eager to see what the new border will be. Dear Stromie, I work as the resident artist of our high school.