I found this ghost decoration at a garage sale for 50 cents. He reminded me of Casper.
Most children of the '70's will remember these decorations from their homes and classrooms, but good luck finding much out about them on the internet. They're called "melted plastic popcorn". I actually guessed the first two words when I first Googled it looking for information. There were decorations for all seasons and holidays. Below are a few other Halloween examples I found on the internet.