Hook a Book - Gives me an idea. Use fishing gear from thrift stores for book display. Cut up a net for holding the individual display books. Fishing poles for sides maybe? Lures? Not sure, but this is a good idea.
Christmas -- Nautical, ship, ocean themed door/bulletin board "All wrapped up in learning" on the door, "Meet the crew" on the said - octopus wrapping a bow around the ship and lights added (Christmas time)