Our classroom was full of flies last week. (Fortunately none of them were real; licensing is due any day now.) The kids, when they arrived last Monday morning, found a hula hoop, full of tape, hanging from the ceiling in a corner of our pretend center.
I really love these. Use a dull pencil to draw a picture by pressing into styrofoam. Paint of with a very thin layer of paint (use sponge/foam brush). Press print onto paper and voila! Could be used for any themed unit