Paintings are non-craftable Decorative Furniture. There are currently 70 obtainable paintings, of which 14 are sold by the Painter under certain circumstances, 15 are found in underground cabins, 23 are found in the Dungeon, 12 are found in the Underworld, and 5 can be gotten from Goodie Bags.
 Paintings List
Note: Catacomb, although being mechanically equal to paintings, in fact is not classified as one. It has a few different possible appearances.