Eddie Breen's Piggyback Art.

From the website:

Art can neither be good or bad, only interesting or boring, says Eddie Breen, the leading practitioner of piggyback art. He takes paintings that he considers boring or incomplete, and inserts nuns, flying jesuses, flame people, or demons, changing the meaning of the composition in ways to suit his visions, to coopt the elements and create his own worlds.

Link (via Jaf Project)