Take the time to view the whole video…
http://www.youtube.com/watch?v=UHN4RjzJX38
I love the one that looks like paint on a canvas.
Now I need to think bigger 
More LEDs and more processors!! Wahahahahaha
How much is a 1MW substation these days?
I saw this exhibit a couple years ago. It was pretty fantastic.
The “swarm” effect is amaze-balls, at http://www.youtube.com/watch?v=UHN4RjzJX38&t=1m27s in the vid!
The “hurricane” effect is even better @ http://www.youtube.com/watch?v=UHN4RjzJX38&t=4m38s
Hrm, I’d like to know how to recreate the display at http://www.youtube.com/watch?v=UHN4RjzJX38&t=13m50s … pretty cool.