As it turned out, I had lots of black cardstock, but didn't have any black string. I did, however, have a spool of black wire. After playing around a bit, I landed on a wire coil connector. I think it turned out pretty cute, so here's how you can do it too...
*printer or pen
*1/16" hole punch
*wire and wire cutters
Step 1: Make Your Bats
Print or sketch your bat silhouette on cardstock. I printed four per page on black cardstock...PDF is included below. You could also print on white, but it will take you a lot more ink to achieve the same effect. If you don't want to print, you can freehand sketch or make a tracing template. Cut out enough bats to make your garland. I used 24 to make three strands. Punch holes in the tips of each wing.
Step 2: Make Your Connectors
Make wire connector coils by wrapping your wire around a pen or pencil about seven times, then snip the end...this will take about 8-10 inches of wire per coil. Make as many coils as you need to connect your bats.
Step 3: Connect Your Bats
Twist one end of your coil through the hole in a bat wing about two times through so that it stays put. Then twist a bat wing onto the other end of the coil to connect the two. You can smoosh or stretch the wire as you like to make the bats stay put.
Step 4: Hang Your Garland
When you have enough bats strung together, hang!