Instructables member onebrokenneck made a robot couple for a costume competition. These classic Hollywood-style robots are made of aluminum, but according to the build process at Instructables, you can probably use cardboard instead if you don't have a metal shop. The arms and legs are dryer ducts, and various LED gizmos were used to give them an electric personality.
15. Cheeseburger: I love that this is a no sew costume, but if you have no time to DIY, consider buying this fun hamburger costume! Also, if you’re in the market for baby cheeseburger costume, my beefy Maxwell is pretty adorable. Check out this post for the DIY baby hamburger costume tutorial. If you have the time to make your own, all of the step by step burger costume is at Please Note.