Have some long and annoying cables lying around? Who doesn't. These ties seriously take under a minute each to make, are free, and will work for a long time.
Step 1: Preparing Duct Tape
Take a piece of duct tape that is long enough to fit around your cables. Fold it in half.
Step 2: Assembly
Wrap the folded duct tape around your bundle of cables and poke the safety pin through. Try to get it as close as you can to the wires for a tight fit. That's it. You're done. How exciting.