Have you considered using one of those paper mache Chinese dragons? Nobody would notice the wires.
Seriously, what's your configuration? If you have a rack, and the wires are behind it, a simple black cloth on the back of the rack would do the trick. Cut slits to pass the wires. For runs across a room, just keeping them neat against the wall can make a big difference. Another alternative is to use some PVC pipe and wrap appropriate, matching cloth around it. I don't think wire will need that much ventilation, but you can always drill a few holes in the pipe. Good luck.
Seriously, what's your configuration? If you have a rack, and the wires are behind it, a simple black cloth on the back of the rack would do the trick. Cut slits to pass the wires. For runs across a room, just keeping them neat against the wall can make a big difference. Another alternative is to use some PVC pipe and wrap appropriate, matching cloth around it. I don't think wire will need that much ventilation, but you can always drill a few holes in the pipe. Good luck.