I admit to having know prior knowledge of these.  Just like MouseWife, I see those and the first thing I think of is 
Garbage Pail Kids.  I was a serious collector of these as a kid, did lots of trading.  It's one of very few fads that I actually followed.  Too bad I gave them to my younger brother, who peeled off all the stickers.  
 
  
  I wish I still had those.