This past week I discovered the waterlogue app (so far just available on Apple products) and I'm having way too much fun with it. It takes your phone photos and turns them into pretty sweet watercolor "paintings." In Paul's words, the human faces look "creepy" - I think it's the eyes - but the results are pretty amazing regardless.
You can play with all sorts of different watercolor "techniques" (just like you'd play with filters) and the images are saved as high resolution so I imagine they would print pretty well. I have a few different projects in mind for how I want to get images like this off my phone and into my house.
tons more info here. I am in no way affiliated with this app, just wanted to share.