Conserve energy with a doorknob decoration that reminds you to turn off the lights when you leave the room.
Cut a lightbulb shape (about 3 1/2 inches wide and 6 inches tall) from the cardboard.
For the base of the bulb, cut out a cardboard strip (about 1 1/2 inches wide and 3 inches long), wrap it around the neck of the bulb, and glue it in place.
Paint the lightbulb and, once it dries, use a marker to draw threads on the bulb base and to print your conservation message. For a hanger, tape a loop of ribbon to the back of the bulb.