Many of the cheap teacher hacks on this list focus on the needs of the students, but teachers need their flowers, too! And if your desk is overrun with paper, books, confiscated cell phones, and enough arts and crafts products to stock a Hobby Lobby, then we're going to go ahead and assume that untidy cables could be enough to push you over the edge. There's a teacher hack for that, though.
The easiest and cheapest way to tidy your cables is to clip binder clips to the back of your desk. You can then clip your cables in place so they're still easily reachable.