I picked up my iPad, unlocked it, and went to the eBay app and did some shopping. I then put it down, and a few minutes later, I picked it up, and the lock screen was an image of New York I've never even seen before. I didn't take, I didn't download it, and I certainly didn't make it my background image. I checked my camera roll/photo stream, it's not there. It's also not an album cover. After a few times of unlocking it and putting it back to sleep my original lock screen image came back. So....WTF?