The Raspberry Pi is a wonderful platform for DIY projects. Thanks to the PicoCube, you can build your own 4 x 4 x 4 LED cube driven by the RPi. It comes with 64 individually addressable LEDs. You can control the patterns on your mobile device.
By playing around with a PicoCube, you will learn how to build more complex smart LED projects. Expected to ship in November. You can find out more about it here.