An album app with gesture controls!
See it in action: http://youtu.be/qnQakZ6NkNc
Wave your hand in front of the screen and go to the next picture!
Swipe left or right, and up or down to control the entire app.
The ideal distance between the hand and the camera is 1 ft.
Picture credit (2nd screenshot), CC-by: NPS / Jacob W. Frank
http://www.flickr.com/photos/denalinps/7956400058/