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The backgrounds app is a free app that has a huge selection of phone background images. They are all free to download and there is quite a variety.10,000+!!!! The images are broken into categories such as Cars, Movies, Space, Cute, Girly, Sports, Quotes, Swirls, Hearts, etc. You can also view by the newest added if you want a quick glance at seeing what`s new. The images come in Retina Display Resolution and are really sharp. There is such a variety in the images from illustrations, cartoons and photographic.
Since there is something for everyone, it is FREE and it will make your phone look good, I highly recommend this app!!
Image Source: http://itunes.apple.com/us/app/backgrounds/id295785957?mt=8