Step 1: Shut down the computers, untangle the cords, and label them. I used used some labels I made with our school logo on them and got for free on VistaPrint:Step 2: Use twist ties or velcro to bind cords together. Some of them I had to double back on themselves because they were too long.
Step 3: (The genius part I wish I could take credit for but read it online somewhere...?): Use foam pipe insulation to cover the mess!
I didn't think to take a before picture, but trust me---the change is remarkable! I used the same trick for the computer at my desk, and it is so nice to NOT see the tangle of cords all the time.