One of my favorite places to get wallpaper for my desktop is InterfaceLIFT, and one of the nicest features is that they let you browse your wallpaper by resolution. They just updated their site now and give you option of using Android resolutions (and iOS if you're so inclined) too. From what I can tell they just don't resize the image, which would screw up the aspect ratio, but they actually crop it to the appropriate resolution. Check it out!
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