Find fabric like Dorothy's dress to make curtains for your classroom. A few red apples, some red glitter items, and old farm items like the box and can would all go perfectly in the Wizard of Oz classroom theme!
Wonderful Wizard of OZ Party Ideas: Vintage Wizard Of Oz Party! - Kara's Party Ideas - The Place for All Things Party --- Some cute decorations - etc. for a Wizard of OZ party. (But how much cake can everyone eat?