My friend(Spooph) did a pretty cool mod to his antec case. Using 30 or so 5mm blue LEDs, the front grill work is now illuminated, and pulsing. Here is his page showing the work: http://www.crash.sowiebinich.com/puter.html
And here's a video I took of it:
http://home.comcast.net/~nolan15/mod.MOV (3.5MB)
The only additional work that was involved in addition to what is shown on that page is reflective foil tape applier to the inside of the grill to disperse the light so you couldn't pick out exactly where each LED was. He made the plusing circuit himself, and it is adjustable for speed.
And here's a video I took of it:
http://home.comcast.net/~nolan15/mod.MOV (3.5MB)
The only additional work that was involved in addition to what is shown on that page is reflective foil tape applier to the inside of the grill to disperse the light so you couldn't pick out exactly where each LED was. He made the plusing circuit himself, and it is adjustable for speed.