Vandalism is not something to be encouraged, and more often it is irritating. But sometimes the act of vandalism itself is so creative, that can be seen as pure art, or too funny to be considered trashing.
… like these cars covered in snow:
… like the sad SpongeBob SquarePants:
… and Ghostbusters are here:
… Darth Vader is everywhere:
… Ooops! Please excuse me!
… and this funny Minion train: