If you're feeling blue, then perhaps a nice shade of yellow will perk you up. Green around the gills? How about a little fuchsia to make you feel better? All this and more can be yours if your house is decked out in digital light. With a simple click of a remote, you can bathe your house in pretty much any color you want. At the center of this technology is the LED (light-emitting diode) bulb. LEDs allow you to pick the color and brightness of light. In addition, LED lights save money because they use less energy than regular bulbs. Several companies specialize in digital lighting products, including one that has developed a microprocessor that can control an LED system that generates more than 16.7 million colors.