Haven't heard of them. I have heard of a blog "Things done to cards". It was usually the sort of things that kids do, like drawing mustaches and beards on the cards, x-ing out a team name when a player is traded and so on.
I collect: Baseball, Football, Hockey, Mostly Vintage pre1980, My Homie teams - Washington/Baltimore Teams Senators (Twins, Rangers), Expos/Nationals, Redskins, Capitals, Bullets/Wizards - HOFers - Non-sport (mostly TV shows and movies).
My Trade List is very much a work in progress
CaptKirk42s Trading Card Blog Curly W Cards Strive For '65 YouTube klandersen42