I made this decoration for our garage door last year as part of our Halloween decoration, but didn't actually get to share it. So posting it again.
Saw the idea in one of the online magazines. Just needed some black craft paper and that was it! I can't find the link to that magazine now, but if anybody does, please let me know so that I can add the source. I remember the link even had the template for the cats and bats, but I just looked at the picture and drew it by hand. (Thank you Becca for providing the source of this idea..:))
Linking this to these awesome parties here, here, here and here.