Yet another Sugru trick. Don't you hate it when a cable falls down on the floor instead of laying still on your desk? You can use Sugru to make clever cable holders.
Just knead and roll the Sugru into a ball. Stick it where you want your cables to be. Take a toothpick or something similar and make a "cut" across the middle, but not all the way through. Press the Sugru tips gently together just so they don't touch each other. Let it set for 24 hours. Then you are done.