Get the proper sized paper clips
Select the right size paper clip, depending on the number of wires that are lying around in your room. Once you have got the paper clip, attach it by putting a screw with a small washer in the centre of one of the handles of the clip. You can attach the paper clip to the bottom side of the wall, desk, shelf or any other thing.
How to operate the paper clip?
After you have attached the paper clip, push on the chrome handle to open the clip. If you have non sagging cables, place one clip 12 inches (30cm) or more aprt from the other. Then align the cables together. Now you can leave the handle and all of the computer wires will be held smoothly in the paper clip.
Be aware of the fact that this is not an unchangeable solution and you can simply remove wires that you do not need anymore. It is way better than the inexpensive plastic card holders that get damaged or are difficult to open once they get installed. Also a good option is to use tape when you have a number of wires, which need to be catered. They are quite durable and will not break your cords as well.