Check out http://steam.tools/ where you can preview just about every community item. Specifically here for backgrounds in full res:
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Wait for someone who has fire in their background... Just wait..
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i am currently using this one
Machiko (Profile Background)
http://steamcommunity.com/market/search?q=Sakura+Spirit+Profile+Background
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Don't have any but i have the tool for it :)
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i currently have http://steamcommunity.com/market/listings/753/313740-Maeko%20%28Profile%20Background%29 listed in the market :D
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nora background from the game riddle corpses for example.
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nothing hotter and manlier than Ultra Meat Man
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Try Roommates, and HuniePop probably.
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My personal favorites:
Crucia: http://steamcommunity.com/market/listings/753/39120-Crucia%20%28Profile%20Background%29
Farm Girl: http://steamcommunity.com/market/listings/753/212910-Farmgirl
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Hello players, im looking for some hot/sexy steam profile backgrounds :P
Just listem all down there, appriciate that.
I am gonna spend !~$20 on hot backgrounds XD
no joke!
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