Far from done, posting so I don't lose it. This is something I update when I have spare time and need something to do.

Red
Bleeding World Wildlife - Background - Where It's Found: March Black Market
Bloodbath - Background - Where It's Found: Negative karma, annihilate hyenas in explore event
Bloody Pit - Background - Where It's Found: May Champion shop/User shops
Burning Blight - Background - Where It's Found: July 2017, end novel 5 with Apollyon

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Pink
Abaddon Skies -Background - Where It's Found: July Firefly Shop
Boneyard - Background - Where It's Found: January The Boneyard
Carcass - Background - Where It's Found: Neutral karma hyena event, snatch the carcass
Dead Lands - Background - Where It's Found: October Blood Beetle Shack
Dreamwalker Realm - Background - Where It's Found: November Shaman shop

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Purple
Amethyst Cave - Background - Where It's Found: February crafting with 30 amethyst
Aurora Australis - Background - Where It's Found: July Firefly shop
Dark Forest - Background - Where It's Found: Neutral karma explore item during the October event
Desert Twilight - Background - Where It's Found: Monkey Business

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Blue
Abandoned Cemetery - Background - Where It's Found: October Blood Beetle Shack
Animal Graveyard Nighttime - Background - Where It's Found: November Shaman shop
Conjuction - Background - Where It's Found: July 2017, end novel 5 with Apademak

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Cyan/Teal
Cloud Forest - Background - Where It's Found: July Firefly shop
Crashing Wave - Background - Where It's Found: Chance to win if you pass the 4444 score on Serengeti Shuffle

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Green
Barotse Floodplains - Background - Where It's Found: June The Flood Pit
Brumous Cold Morning - Background - Where It's Found: Craft 30 Underbrush
Cave Den - Background - Where It's Found: Monkey business shop
Chimanimani Mountains - Background - Where It's Found: July Firefly shop
Cthulhu Depths - Background - Where It's Found: October Blood Beetle Shack

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Gold
Acacus Mountains - Background - Where It's Found: August The Preserver's shop
Arabian Desert - Background - Where It's Found: Reptile Roundup game, desert section (Hard recommended)
Dry River Bed - Background - Where It's Found: Monkey Business

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Brown
Animal Graveyard Daytime - Background - Where It's Found: November Shaman shop
Arena Gorge - Background - Where It's Found: May Champion shop
Ashlands - Background - Where It's Found: August Destroyer's shop
Badlands - Background - Where It's Found: September Prophet shop
Boglands - Background - Where It's Found: December Wallowing Pit
Championship Arena - Background - Where It's Found: May Champion shop
Chasing Rainbows - Background - Where It's Found: Monkey Business shop
Crowded Backstage - Background - Where It's Found: May Champion shop
Dead Forest - Background - Where It's Found: August Destroyer's Shop
Draconids - Background - Where It's Found: July Firefly shop
Drying Water - Background - Where It's Found: August Protector's shop

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Orange
Item - Background or Decor - Where It's Found: location
Item - Background or Decor - Where It's Found: location
Item - Background or Decor - Where It's Found: location

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White
Item - Background or Decor - Where It's Found: location
Item - Background or Decor - Where It's Found: location
Item - Background or Decor - Where It's Found: location

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Grey/Silver
Championship At Night - Background - Where It's Found: May Champion shop
Charred Lands - Background - Where It's Found: August Destroyer's Shop

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Black
Item - Background or Decor - Where It's Found: location
Item - Background or Decor - Where It's Found: location
Item - Background or Decor - Where It's Found: location