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Put a wall-sized skull in your living room for the price of a pumpkin. A small USB projector on a bendable gooseneck. Clip in a pattern disc, aim it at a wall or a ceiling, turn the lights off, and the room stops being your living room.
Spider, bat, ghost, skull, jack-o'-lantern, cobweb, handprint, grim reaper, haunted castle and more, depending on which set you choose.