Redditor zoggy90 has been drawing on walls and doors, but it's his house, not his parents' home. He's filling the side of the closet with "little spirits." Above is the first one, which he has now expanded upon.
These are pencil drawings, which will totally freak out the next owner of the house, whenever that will be. meanwhile, there should be some way he can sell these without having to draw on other people's homes. (via reddit)