This Interactive Mirror project by OpenGadgets is based on the IOIO Microcontroller which looks like it is very flexible. A 32X16 pixel matrix display is mounted behind a 2 way mirror, this display is connected to the IOIO microcontroller and talks to the Android phone using bluetooth. With the current implementation you are able to send things such as low resolution pictures and video to the display. There is also a version of magic 8 ball that looks like fun.