Nexus: The Jupiter Incident

Realms of Chaos
Raptor
Another World
Serious Sam: The First Encounter
Elder Scrolls III: Morrowind (or at least, it doesn't appear for me when I search for it, and I have too many to look for it.)
the Alien Shooter games
the Alien Breed games
Gothic 2
Mount & Blade: With Fire and Sword
Shadow Warrior: Classic Complete
Shadow Warrior (Reboot)
Divinity 2
Divinity Original Sin 2

I'm guessing this is a quirk that has to get ironed out?

Sometimes it takes a while to load or something. I've had to click the game I want as a background, click another random one, then click the one I want AGAIN for it to load. Just fyi.

SWAT 3 and XIII(removed from store) are missing from the backgrounds ;).Cheers

I checked on another device, so it's at least not an issue with my desktop setup. I currently have one of them set as my background, so you can go see for yourself.

I guess I'll send a bug report about this, even though I quite like the black background...

Grim Fandango (already listed) has no background. Excuse me but I'll rip a tiny little rage.

You're right.

I also see a black background on your end. Oh my.

Guess I'll be adding them with a disclaimer that there is a background with these games, but they're black. :/

Hostile Waters: Antaeus Rising
Waking Mars
Europa Universalis: Rome Gold (EU3 Complete has one though)
Icewind Dale Complete - not on sale
Toonstruck
Richard & Alice
Hearts of Iron II: Complete (Darkest Hour has one though)
Shelter
Race Driver: GRID - not on sale
Sam & Max Hit the Road
Deadly Premonition: Director's Cut
Beyond Good & Evil
Dark Fall 2: Lights Out
Desperados: Wanted Dead or Alive
STAR WARS™ Knights of the Old Republic™ II: The Sith Lords (first KotOR has one though)
Men of War: Red Tide
Soldiers: Heroes of World War II
Myst 5: End of Ages
The Shivah
Pathologic - not on sale
American Conquest
Cossacks Anthology
The Whispered World: Special Edition
Total Overdose: A Gunslinger's Tale in Mexico
Night of the Rabbit
Goodbye Deponia (although first two have backgounds)
Risen
Risen 2: Dark Waters
A New Beginning: Final Cut
Back to the Future: The Game
Arcanum: Of Steamworks and Magick Obscura
Machinarium
The Last Express
The Bard's Tale
Tropico 1 and 2

Sam & Max: The Devil’s Playhouse
Sam & Max Beyond Time and Space (first season has one though)

Witcher 3 has background image.
probably it's worth to mention in respective entries that Gothic 1 and Dreamfall: The Longest Journey have profile background images.

since it's just backgrounds from store pages, i really don't get why some of them are missing. maybe they're working on alternative versions? it'd be cool to use Red Tide cover art among others.

I have a background for D:OS 2 (attached).

Quite right, I didn't see it because it isn't a title I own yet. :S

An Elder Scrolls Legend: Battlespire
Anno 1404: Gold Edition
Assassin's Creed®: Director's Cut
Atlantis 2: Beyond Atlantis
Atlantis 3: The New World
Atlantis: The Lost Tales
Baldur's gate: the original saga (removed)
Banner Saga 2
Battle Chess Special Edition
Battle Worlds: Kronos
Black Mirror 2
Blackwell Bundle
Broken Sword 2: Remastered
Broken Sword 3: The Sleeping Dragon
Broken Sword 5 - the Serpent's Curse
Caesar
Caesar 3
Carmageddon 2: Carpocalypse Now
Celtic Kings: Rage of War
Cognition: Game of the Year Edition
Colonization, Sid Meier's
Commandos Ammo Pack
Commandos 2+3
Conquests of Camelot: The Search for the Grail
Conquests of the Longbow: The Legend of Robin Hood
Corsairs Gold
Dark Reign + Expansion
Desperados: Wanted Dead or Alive
Disciples 2 Gold
Disciples: Sacred Lands Gold
Disney Aladdin
Disney The Jungle Book
Disney The Lion King
Eador. Imperium
Eador. Masters of the Broken World
Elder Scrolls Adventures: Redguard, The
Empire Earth 2 Gold Edition
Empire Earth Gold Edition
Eschalon: Book II
Fallen Enchantress: Ultimate Edition
Fallen Enchantress: Legendary Heroes
Fallout 2 classic (there is a background for Fallout 2)
Fallout classic
Fallout tactics classic
Freddy Pharkas: Frontier Pharmacist
Gabriel Knight 2: The Beast Within
Gabriel Knight: Sins of the Fathers
Gobliiins pack
Heroes Chronicles: All chapters
Heroes of Might and Magic® 5: Bundle
Heroes of Might and Magic® 2: Gold
Heroes of Might and Magic® 4: Complete
Imperialism 2: The Age of Exploration
Indiana Jones® and the Fate of Atlantis™
King Arthur Collection
King's Quest 1+2+3
King's Quest 4+5+6
King's Quest 7+8
Knights and Merchants: The Peasants Rebellion
Konung 1 + 2

Haven't seen a background for Neverwinter Nights or Rune classic.

Labyrinth of Time, The
Lands of Lore 1+2
Leisure Suit Larry
Leisure Suit Larry: Love for Sail!
Leisure Suit Larry: Reloaded
Lords of Magic: Special Edition
Lords of the Realm: Royal Edition
Lost Eden
Majesty 2 Collection
Master of Orion
Master of Orion 1+2
Might and Magic 6-pack Limited Edition
Might and Magic 8: Day of the Destroyer
Mortal Kombat 1+2+3
Myst Masterpiece Edition
Patrician 1+2
Pirates! Gold Plus
Police Quest Collection
Prehistorik 1+2
Quest for Glory 1-5
Rain World (bugged)
Real Myst Masterpiece Edition
Incredible Machine Mega Pack, The
Return to Mysterious Island
Riven: The Sequel to Myst
Robin Hood: The Legend of Sherwood
Settlers 2: 10th Anniversary, The
Settlers 3: Ultimate Collection
Seven Kingdoms: Ancient Adversaries
Sid Meier's Alpha Centauri Planetary Pack
Space Quest 1+2+3
Space Quest 4+5+6
SpellForce 2: Demons Of The Past
Stronghold Crusader HD
Tex Murphy: Mean Streets + Martian Memorandum
The 11th Hour
The 7th Guest
The Adventures of Willy Beamish
The Black Mirror
The Book of Unwritten Tales
The Book Of Unwritten Tales: The Critter Chronicles
The Colonel's Bequest
The Dagger of Amon Ra
The Dig
The Guild 2
The Guild 2: Pirates of the European Seas
The Guild Gold Edition
The Legend of Kyrandia(Book One)
The Legend of Kyrandia: Hand of Fate (Book Two)
The Legend of Kyrandia: Malcolm's Revenge (Book Three)
The raven: legacy of a master thief (the remastered version has a background)
Thimbleweed Park
Torin's Passage
Total Annihilation: Commander Pack
Total Annihilation: Kingdoms + Iron Plague
Tzar: The Burden of the Crown
Wasteland 1: The Original Classic
Wasteland 2 Director's Cut Digital Classic Edition
Wizardry 6+7
Worms 2
Worms W.M.D
There are backgrounds for both Neverwinter Nights (attached).