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POPSHow to make your refrigerator box house stronger Mr. McGroovy's Box Rivets. Use these rivets to hold together your cardboard box creations: castle, carriage, tank, race car, haunted house. I remember how excited the neighborhood kids would get when someone's parents got a new large appliance. We'd play the heck out of that box until it fell apart. Refrigerator boxes were the best. This site has plans and ideas on how to create cool things with boxes and rivets.