Jeff wanted a sky theme this year, so we tediously stuck hundreds of rolled-up pieces of masking tape all over the walls, cut the bulletin board paper to size, and stuck it on the walls. We acquired the blue fabric for about twenty-five cents a yard and hung it from the ceiling, then we hung planes, birds, pterodactyls, a flying squirrel, and a few other animals (that don't actually fly) from the ceiling as well. This elicits lots of interesting questions from parents and students alike. Out-of-the-box thinking is always encouraged in our classrooms.
Resources:
bulletin board paper - Ken's Joys
fabric - Zook's Fabrics
toys hanging on ceiling - Ken's Joys, Michael's, etc.