I stumbled upon this app last week and began making every photo in my phone a watercolor painting. Here is one of 1000 I've converted...
I have spent more time than I care to admit, taking photos and watching them transform into watercolor paintings. The app is $2.99 and well worth it, for no other reason than you feel like your quite the artist when you look at the end product (because me and art? Not so successful. Love art, not good at producing it).
Only for iPhone and iPad (sorry Droid users :()