Funny you should ask that, I modded mine just yesterday. Not so it would look cool or anything, I just made it to accomodate a 12cm fan. I'll show you pics once I've redone the paint. Basically I did a fan grill template in photoshop, then I printed it, taped it to my case, made each hole indented (so they'd be marked for the drill and so I was able to drill with max precision) then I drilled the holes . I'm looking to do a few more modifications... perhaps add a few neon lights or something.

Cool. Yea I have 4 led fans and 2 3-led lights coming in the mail, should get them in the next day or two. Will post pics. Hope to see pics of your mod

I originally planned on modding my tower when I built the machine. But I ended up not having any room on my desk, which meant the box had to go on the floor. I figured it was a waste of money to mod it when it would just be sitting by my feet under my desk. The inside of my machine is still all nice looking though - all of the wires are grouped together in mesh tubing.

Cool
Yea I rounded my ide cables, so in the pics you can hardly tell they're there. (view my tutorial on how to round ide cables)

I've done a little bit, mainly for functionality, not the "wow" factor...

I cut two holes on the side of my case to accomodate two 92mm Vantec Tornadoes, so I've got GOBS of air coming into my case now. I also drilled a whole bunch of holes through the front bezel on my case, so the 80mm fans I installed on the front of my case wouldn't be restricted.

Like I said, I was completely going for function-- All of my IDE/floppy cables are rounded for better airflow, my PSU has a 120mm fan on the underside of the unit, and an 80mm intake fan on the other side, blowing air through the PSU, also exhausting out the back. All of the Blue LED lights I have in my system just happened to be in there because of my choice of components.

when i build my new computer (hopefully this fall, i have been saying that for almost a year now ) but anyway i plan on doing alot to it even tho it will be hiden inside my desk i will still mod it jst for the fun of it

im actually in the proccess of modding a case right now. i just have to finish the paint job on one of the panels. fit the glass into the panel and look into getting some nice glowy stuff and maybe some nice glowy fans!

yeah that's basically all I've done. Just drilled a grill in the side panel for a 12cm fan. My Girlfriend painted it last night to get rid of the scratches where I sanded it. But you can tell where it's been painted because it's a little elevated (and the color is a little different), but I'm going to print out some glossy stickers just to make it look better. You'll have to wait for pics I'm afraid *sigh*.

Pics of my mod are attached... feedback? Suggestions? There is a little bit of work that needs to be done yet...