The replace background option lets you selective part of your photo and then place that selected piece on an image from your gallery as a different background. (zdnet.com)
(although I wish they would add the off white background option they offer on the nook HD - it's much better than bright white). (goodereader.com)
Second, there are zero background options available for background category, which means we need to hunt down an appropriate image we want to use for season one. (howtogeek.com)