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.