They changed from a normal image of an 1800's gentleman and woman to these rotted versions. There were two other images that went along with these, one of a young girl and the other a carriage driver and his horse, which both became skeletons. These were fun to work on. I used actual 19th century public domain daguerreotypes, that I worked on in Photoshop with textures and painting.
One of these days I'll post the additional images along with the sticker set.