This is an oldie but a goodie! I did this one last year with my “Halloween dream team” where I used to work. It made quite a dramatic effect down a long hallway!
This year, I made just a few to liven up the corner by our dining room. Super cute and easy! Just cut out some bats (there are lots of templates online) out of black construction paper in different sizes and then tape them on the wall in a pattern.