If you use a laptop, charge your phone at your desk, or have any other loose cables, you need something to keep them from falling onto the floor. Instructables user openproducts shows us how to create a small, nearly invisible cable catcher out of rubber tubing.
While binder clips work pretty fantastically as cable catchers, this method gives you a bit more versatility, and isn't quite so big and bulky. All you need is a bit of rubber tubing, some scissors, and a small nail to attach it to your desk. Hit the link to see the step-by-step process (or to order some pre-made ones if you aren't up to DIY).
Cable Clip from Tubing [Instructables]