I love a good iOS photography app, I use quite a few on a regular basis and have experimented with loads. I've recently come across Dubble, a new double exposure app that randomly pairs your image with that of a stranger. Often the outcome is a bit of a mess, but with a little bit of persistance and plenty of luck there are some really nice outcomes. It can be quite addictive once you get in the swing of things.

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If you are feeling adventurous, try double dubbling.
The app is easy to use and free to download in the app store.
Check out my profile: dubble.me/bentopliss