We've made cinemagraphs in the past, but we hadn't seen jaw-dropping HD results until the Echograph. Recently referred to as "the Instagram of animated GIFs" by Wired, Echograph ($3) allows you to paint video elements into still photographs.
So how does the app work? After capturing or uploading a video onto your iPad, trim a five-second video clip and choose a specific frame as the still image. Next, you use your finger to erase part of that image, then replace it with dynamic video to create an Echograph. In other words, it's art meets photography meets video — how cool is that?