Halloween tape ghost: wrap form, in sections, in packing tape. Sticky side out first then sticky side on top. Cut down the side and tape together at the join. Spray glow in the dark or use glowsticks inside.
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?