Our final group project for ECE 4180 (Embedded Sys. Lab) was an 8x8x8 LED cube, built from scratch, solder and all! The brains behind this masterpiece is an mbed microcontroller (mbed.com).
For a quick how to, circuit diagrams, and some videos, go to ahmedis.com/leds or go to the Website folder and click on 'index.html'