Picfx may not be the best app for serious photography, but it does one thing exceptionally well: it gives you the freedom to completely change your images with a multitude of layered effects.
With Picfx, you can slap on a filter to give your image that retro look like you can with other photo apps. But you can also add as many layers as you'd like to turn your image into something completely different. The app comes with tons of different filters to choose from and has some of the better simulated textures (like crumpled paper, for example) of any app in the genre.
Though some may turn up their nose to slathering on a ton of effects, Picfx makes it easy for those who like to start with an image and build it into a work of art.