title: What's is the most efficient way to generate a random image on the iPhone
body: <p>For testing purposes I would like to generate a large quantity of unique images and store them in the Camera Roll (via ALAssetsLibrary) on an iPhone. Ideally these should approximate the size of real user photos.</p>
  
  <p>I've tried considering generating images with random colors, but these tend to compress to smaller sized files than typical camera pictures. </p>
  
  <p>I'm currently generating an image from entirely random bits but I was wondering if there were any other ways I should consider which would better approximate pictures taken by real people.</p>
  
  <p>My aim is to do generate rapidly as possible so pulling images from flickr is going to be too IO bound.</p>