One of my current favorite apps for taking an ordinary photo and turning it into something that looks as though I have been working hard with a canvas and paints is Pencil Camera HD.
I love that I can look at dozens of ideas in a space of minutes and choose one that resonates with me. As I've never taken time to learn how to sketch, being able to create sketches from my photographs is really exciting for me. I am so grateful to the technical geniuses out there who make this possible!