I got this sandwich DIY Halloween costume idea from my brother a couple weeks before Halloween. It cost around $40 to buy supplies (thank you, Home Depot). My sandwich took me two weeks to build. I used cardboard for the bread and face and the rest was all foam and spray paint. To hold it up I stapled duct tape to each side of the cardboard (front and back) and used those as shoulder straps. I could see through tiny eye holes beneath the eyebrows (which were black bandannas cut into ovals). Everyone at school loved it!