Christmas lights are as much a part of the holidays as snowmen and Santa Claus, but those colorful strings consume lots of energy. Get off the naughty list by decorating with energy-saving, cost-efficient LED light strings, which use the same computer-chip technology used to light calculators and watches. LEDs consume up to 98 percent less energy than incandescent lights, last up to 200,000 hours (about 22 years) and remain cool to the touch. In the unlikely event that one does burn out, the rest of the lights keep on glowing (no more searching for the bad bulb). Plus, since the color is generated by an actual light spectrum as opposed to a glass bulb dipped in color, those reds, blues and greens are even more vivid and brilliant. $13.99 to $18.99 at HolidayLEDs.com.