A remix of https://www.thingiverse.com/thing:166744 to add 12mm by 2mm magnets to the back of the ghost. I got the inspiration from http://3dprintingforbeginners.com/glow-in-the-dark-fridge-magnets-for-halloween/ since I had a lot of leftover neodymium magnets from another project.

I've also added eyes and a mouth for each of the ghosts. I was able to print them out and snap them in place without glue. I found they go in best if you push them in from the back as sometimes there's a little lip on the top of the eyes and mouth. Depending on your printer or settings, you may need a dab of super glue to hold them in.