There's no better time than Halloween to let yourself go batty with your home decorating.

For each bat, trace and cut a wing shape from black card stock (choose from three printable templates; Bat 1, Bat 2 and Bat 3).
Use a piece of double-sided tape to stick one end of an 8-inch length of the boa to the center of the card stock. Wrap the boa twice around the wing shape, then stick the free end to the double-sided tape.
Use more double-sided tape to attach a pair of white paper eyes with black marker details, then hang the bats overhead with fishing line.