Unfold a paper napkin and place it on a flat surface.
Place two or three cotton balls in the center of the napkin.
Gather the napkin around and beneath the cotton ball making the covered cotton look like the ghost's head.
Tie a piece of string securely under the head and cut off excess string.
Draw two eyes on the head.
Repeat the process until you have the desired number of paper ghosts.
Tie a piece of fishing line to the ghosts and hang them with a thumb tack.