iOS 7 adds photo filters. Instagram, Facebook and just about anything with photo sharing offers filters. Adobe is probably well aware of that, and has added more filters to its Photoshop Express app.
The app is now updated with a new interface and more than 20 new filters. However, many of Adobe’s filters are designed to help clean up photos with auto-fix and color/contract correction-type effects. Most apps, such as Instagram somewhat distort your original photo or make it look less saturated, etc. These seem more geared at making pictures look better. None of that artsy stuff the hipster kids use when taking a photo of their caffé misto at Starbucks next to their MacBook Pro.
You can check it out here. It’s free.