I recently switched back to iPhone after using Android for a while. My personal preference is definitely iPhone.
Anyway, this has led to exploring what apps I've missed in the meantime.
One photography app I've been playing with is called "Enlight". It's really, really great. Here's the link.
Check out the demo video on that site.
I've been using the app to add filters, text, backgrounds, and make other adjustments. It's an inexpensive app, and it's a lot of fun.
I'll probably select it as my pick-of-the-week on an upcoming Paperclipping Roundtable.