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One of the photographers behind one of my favorite wallpapers in elementary OS has their own CC0-licensed photography collection! Check it out: http://cupcake.nilssonlee.se
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
omg @k80bl80@twitter.com just pointed out it’s “CupCake,” a treat of Creative Commons Zero licensed photos. Stinkin' cute.