Un4Seen:
I can see it Nice! Aren't those 5mm LEDs?
Yes they are 5mm diffused LEDs. I started with a 3x3x3 cube and made it work basically but, had one bad LED. I then bought 100 more LEDs and made the cube bigger to 5x5x5.
Here is where I got the LEDs. They did take around 3 weeks to arrive using the standard mailing option.
http://stores.ebay.com/LED-Wholesale-World/Blue-LED-/_i.html?_fsub=2777255010&_sid=1016205190&_trksid=p4634.c0.m322