Skeleton Treat-Bag Labels
These animal skeletons can be found in clip-art books. You'll also need self-adhesive paper that glows under a black light.
Source: Martha Stewart Living, October 2008
Using a photo-editing program, invert desired skeleton image so that the background is black and the bones are white.
Adjust image size as needed to fit onto a paper bag. (It is possible to fit more than 1 image on a page.) Print onto a sheet of self-adhesive paper.
Use a round-corner punch to finish the edges. Affix label to bag. Repeat to make multiple bags.