The premise of this app by Marco Land was enough for me to buy it immediately:
With 657 billion digital images per year being captured and pushed to the web, it is likely that at some point in your life you’ve taken a photo that already exists. And you will continue to do so with the help of this app.
CCamera is the first camera app that takes images that have already been uploaded to the internet. It brings your photos to the next level — because they’re not yours.
It costs a dollar and will probably give you more satisfaction than a Snickers bar. Totally worth it.