Waterlogue is a really amazing watercolor filter app. Frankly, it makes me give up on any ambition I ever had to master watercolors--that good.
Not to say your job as an artist is done completely for you. You need to really think about carefully composing those photos that you use as source images. In fact, it's an interesting app to use just to check your compositional skills!
The only feature of this app that was a little mysterious to me was how to save a completed image. Various save and send functions, including saving to your camera roll, are accessed by clicking on the heart icon.
