Muzei is a great alternative for Android users which predominantly features art but, with plugins, can show a variety of sources, such as National Geographic photos, NASA photos, or your personal gallery. (I actually wrote a plugin for it that generates soft, gentle Rothko-esque backgrounds called MuzeiColours.)
Been using it for a while now. I love it for iPhone. For Mac, it is very curated but there are not enough wallpapers for somebody who spends 12 hours a day in front of her laptop;) I know them by heart now! So, I turned to the new Behance Wallpapers this weekend which has the potential to make me forget Kuvva on my mac. The guy behind kuvva (@nalden) focuses on exploring new ways to reach people without interrupting them and has been doing fantastic projects in this space => http://nalden.net/
Been loving this for a while. Only problem is that some of the wallpapers have borders not cut out properly and support didn't really care. Usually fantastic though.
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