Hey just wanted to mention a source of custom color sleeved usb dac cables. http://www.mimic-cables.com/ he mostly makes custom cables for mechanical keyboard enthusiasts on geekhack.org but if you ask, he can easily make it a usb dac cable. He has tons of different color sleeves. He doesn't claim it has any special sound enhancing properties, but it looks great and is sturdy and you can get it color matched to your equipment/leds.
Some more pictures of his cables http://geekhack.org/index.php?topic=36065.0
Here's mine in royal blue with ferrite bead. The connectors are silvered colored but the actual contacts inside are gold plated.