[GoBeau]

The best use of any Cat5/6 wiring left over not needed is to add a surveillance system that works over IP. These are the best options for surveillance systems. You get a PoE switch and it powers all your cameras - no batteries to worry about. Always a nice option to have when vacationing away from your home to monitor what is going on. You can even add water sensors, thermostats to your home that can all be controlled and monitored remotely. Although these last two items mostly work on Wi-Fi they are very much a nice feature to any home and a sense of security. This is what I would look at doing with the extra Cat5/6 cabling. Pull them back and run them to the outside points monitoring your entrances and add a few cameras outside and even a few inside.