You can buy several types of guides that attach to your router so you can create decorative circular grooves on the surfaces of wood projects, or you can make up your own. Besides making grooves of various designs by switching router bits, these jigs can also be used to make circular cut-outs. Instead of cutting only partly into the surface, continue with shallow passes until the cut is all the way through the wood.
Unplug electronic equipment that is rarely used, In the average home, 75% of all electricity used to power home electronics is consumed while products are turned off. Across the U.S., this equals the annual output of 12 power plants.