Garratt Gallagher from CSAIL/MIT has created a fun Kinect hack: Kinect Piano! You hold your hand steady in front of the Kinect and then move your fingers to play individual notes. You can find the code in the piano package in mit-ros-pkg.
This hack also comes with a library to help you create your own -- Garratt wrote a kinect_tools package that uses pcl to implement a hand detector, which he demonstrates below:
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