I found a pretty fun iPhone application called "QuadCamera" (iTunes link).
The results look quite similar to the 4-lens lomo fun cameras, except that of course the iPhone doesn't have 4 lenses. So it's created by taking 4 shots in rapid succession. Not too rapid though, so you can actually change between shots. The timing is also adjustable and the application has quite a few effects.
See below for a stupid example (some effect has been added by using iPhoto - decolorized a bit)
