Wallbase is dying: see [1].<p>4walled.cc is a similar if much less polished service. Also see WallHaven.cc, which some of Wallbase's staff is working to make Wallbase's new home.<p>[1] <a href="http://www.reddit.com/r/YouShouldKnow/comments/1tbux9/ysk_about_wallbasecc_a_place_for_wallpapers/ce6g86j" rel="nofollow">http://www.reddit.com/r/YouShouldKnow/comments/1tbux9/ysk_ab...</a>
I'm wallpaper-obsessed and I recommend Kuvva (<a href="http://www.kuvva.com" rel="nofollow">http://www.kuvva.com</a> ). It gives you curates bursts of 7+ quality original wallpapers every week, on iOS and OSX, thanks to a partnership with actual art galleries.<p>This said, I think there's still a niche for a website or app specialising in new <i>minimalistic</i> wallpapers. Also, I'd pay for a "wallpaper-on-demand" service where one could order custom pics - I think photo websites like 500px are missing a trick there.
A nice source of wallpapers are the 'Featured pictures' from Wikimedia Commons:<p><a href="https://commons.wikimedia.org/wiki/Commons:Picture_of_the_day" rel="nofollow">https://commons.wikimedia.org/wiki/Commons:Picture_of_the_da...</a>