One of the first photo editing app I installed on my iPhone 3G back in the day was TiltShift Generator, which quickly became one of my favourites to add blur/vignetting effects to my photos. The developer has recently released a new and improved iOS 7‑only version of the app, sold separately as TiltShiftGen2. The UI is more polished, and there are new features such as filters and a live preview. If you loved the original TiltShift Generator, you should consider getting this new version. For $0.99 / €0.89 it’s really a steal.