Photo Toaster is a universal photo editing app, especially good for quick and easy processing. It offers iPhone and iPad photographers a collection of ready-to-use presets and it also allows the creation of personalized effects.
Grungetastic comes with several grungy presets, for giving photos a dirty, old, distressed look. The app includes a rich collection of textures and borders, which you can adjust to your photos to create your custom effects.
PS: the offer is valid only for the iPhone version of Grungetastic.