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How to decorate with alien cocoons for halloween
Create a backdrop for your lair, unless your walls look creepy enough to show through.
Lay out a roll of dark paper or fabric large enough to cover your space, and spray paint them to add dimension and give them the color you want.
Cut and hang the backdrop.
This is like wallpapering, only not as precise or sturdy. Measure the height of your walls and cut sheets three or four inches longer off your prepared paper or cloth.