Paintings

Paintings are decorative furniture items that can be placed on background walls. Each is a framed image that depicts a particular scene, usually Terraria-related. Their tooltips generally contain a person's name, apparently intended to credit each painting's artist; some names may be fictional, though some correspond to known Terraria sprite designers (see Trivia below).

There are currently 126 paintings, 24 of which are sold by the Painter under certain conditions, 7 by the, 4 by the after a golf score of 2000 under certain Moon phases, and 13 are randomly sold by the Traveling Merchant. 15 other paintings are found placed naturally in Underground Cabins, 14 in the Underground Desert, 24 in the Dungeon, 12 in The Underworld, 5 randomly acquired from Goodie Bags, and 8 awarded randomly by the Angler for completing a fishing quest. Additionally, the has 16 exclusive paintings.

Blood Moon Fishing
"Dread of the Red Sea" (idk how to make tables)

Hallow Fishing
"Lady Of The Lake" - J. T. Kjexrud

Solar Eclipse Drops
"Requiem" - C. Rohde. Depiction of the Grim Reaper.

"Ocular Resonance" - C. Rohde.

"A Machine for Terrarians" - J. Witzig. Depiction of a Butcher.

"Wings of Evil" - G. Groviar. Depiction of Mothron.

"This Is Getting Out Of Hand" - C. Rohde. Depiction of a The Possessed.

"Eyezorhead" - J. Parker III. Depiction of a monochrome Eyezor in a suit.

"Midnight Sun" - X. Calder. Depiction of an eclipsed sun.

"Buddies" - T.T. Shabbick. Depiction of a Frankenstein and a Swamp Thing.

Floating Island
"High Pitch" - T.T. Shabbick. Depiction of a flying harp. Dimensions 3x3

Misc
"Cat Sword" - A. Spinx. Depiction of meowmere in the ground. 3x3

"Constellation" - S. Grimson-Smith. A bunny made our of stars. 6x4

"Heartlands" - J. T. Kjexrud. A field with 2 mountains in the back. 3x2

"Love is in the Trash Slot" - K. Tollenaar. A man with a balloon with rips at the bottom. 2x3

"r/terraria" - The Terraria Community. 6x4

"Secrets" - J. T. Kjexrud. 2x3

"Strange Growth" - S. Grimson-Smith. Picture changes to various plants when placing. 2x3

"Sufficiently Advanced" - M. User. Depiction of the Wizard. 2x3

Trivia

 * Some tooltip authors correspond to members of Terraria's development and testing staff:
 * : Victor "Crowno" Moura (Golfer, Painter, Traveling Merchant, Underground Cabins, Dungeon, Goodie Bags)
 * : Will Garner (Underground Cabins, Dungeon, Underworld)
 * : Moosdijk (Dungeon)
 * : Jamison Hayes (Traveling Merchant, Goodie Bags, Angler)
 * : Jim T Kjexrud (Underground Cabins, Underworld)
 * : Cody Burczyk (Dungeon)
 * : Aaron Craig (Underworld)
 * : Kolf (Underground Cabins, Dungeon)
 * : Wright (Dungeon)
 * : David Phelps (Underground Cabins)
 * : Duncan (Underground Cabins)
 * : Ness (Dungeon)
 * : Leinfors (Underground Desert Cabins)
 * : Aurora (Underground Desert Cabins)
 * : Criddle (Underground Desert Cabins)
 * : Darthkitten (Underground Desert Cabins)
 * : darthmorf (Underground Desert Cabins)
 * : Khaios (Underground Desert Cabins)
 * : UnitOne (Underground Desert Cabins)
 * : Xman101 (Underground Desert Cabins)
 * : Zoomo (Underground Desert Cabins)
 * : Klei Entertainment (Traveling Merchant), developers of Don't Starve
 * The desert paintings are named after the testers that created the art for those paintings.
 * The frames on the paintings generally correspond to a wood or block.