More XParticles Bliss.
This one is made up of a shapes (cube/sphere/pyramid) in a cloner with a random noise attached for movement. XParticles was told to target/cover the cloner, Operation set to 'visual polygons using rays'. This makes the particles stick to only lit up parts of the cloner. Pretty cool. Tolerance was also set to 100. To finish it off I used a mirror effect in FCPX and made the sound track in Ableton.