Here's mine. As you can see from the photos, I've tried to tie up any extra lenghts of cable and keep them off the floor where possible. It all starts under the desk:
The middle tower is an APC Back-Ups RT 2000VA. All the computer equipment in my living room is plugged into it, and I actually have enough to push it over its load limit if I turn everything on. A shot from behind the boxes:
I pulled the frontmost box out a bit for a better view. You can see the tracks on the dust, which indicate I failed to vacuum from behind them. I shall rectify the situation after making this post. Moving to the top of the desk, some network equipment:
My local computer superstore sells even more colors of network cables. The thing with the wire mesh cover is my firewall/router box. It does not contain any moving parts, and gets rather warm. Still, it's served me for more than three years now. Next, some cables behind my main displays:
And lastly, some random chargers and stuff in the corner:
The computers down there are not in use right now, I've just put them there to be out of the way. Both are in a good working condition though. They also serve as a handy platform for the extension cord.