Sometimes illustrating the way a job should *not* be done is a powerful educational tool. I have collected a gallery of messy and ridiculous cabling jobs:
http://gallery.colofinder.net/shameful-cabling
my favorite (not horrible, but funny): http://gallery.colofinder.net/shameful-cabling/cables
Anonymous submissions can be sent to [EMAIL PROTECTED] , equipment labels and faces will be blurred if requested.