If you have a TV, you can get your groove on with the Groovetube. Just stick the plastic box on your TV, turn it on, and watch the light and pretty colors from your TV change through the diffused plastic grid. I guess it's useful if you want something to space out in front of, or maybe if you're having a party and want cool ambient lighting. It's like the lavalamp meets the TV yulelog, yeah!

Another similar concept in ambient lighting (but sans TV) is the Twist Together Light, designed by Glide. You can shape and connect the 6 cubes into various configurations to fit your moods and needs. Available in 2 different color combinations, candy and chocolate (shown above).

Available at Velocity