iWorldWideApps has just introduced Camera FX+ for iPad 2 and iPhone 4S. The application has a graphical user interface (GUI) that resembles the look of a DSLR camera, and allows you to apply various effects to your photos. You can use your existing images or take a photo from within the app, and then post the resulting image to Twitter or Facebook. Currently, Camera FX+ sells for $2.99 on iTunes.