Buy white paper lanterns at any party store. Print out Jack Skellington pumpkin carving pattern (also pinned here). Cut out pattern. Tape or glue to lanterns. (You can also light them up with string lantern lights)
A water balloon with a glow stick on the inside, in a stocking, hung from trees, patio cover, or the ceiling. Same pin elsewhere said: "Put a glow ball in a white stocking and hang many from trees or the ceiling." But what are glow balls?