Holiday Lights strings rows of Christmas tree bulbs around the edges of your screen, with festive music playing in the background. It even includes a screen saver with gently falling snow and other seasonal choices to put you in the holiday spirit.
If you wish, the colorful lights can flash on your desktop while you continue to work, so it's not just a screen saver. Choose from more than forty different bulbs for any season, including standard Christmas tree lights, chili peppers, stockings, holly, snowmen, happy faces, Valentine's Day hearts, Thanksgiving turkeys, Halloween Jack-O-Lanterns, Hannukah dreidles and menorahs, and more.
Is it useful? Well, no. Is it really cool? Absolutely!
More info here: http://www.tigertech.com/hlights.html