It may seem silly, but it is a debate I have been in a number of times myself, and based on this article, I am not alone: Colored vs. White Is a Christmas Light Debate – NYTimes.com. Personally I lean towards colored lights on the Christmas tree and white or monochrome outside, though not the blinking kind (they drive me crazy). However I have been overruled in my house and we have gone with white lights in and out. That’s fine by me, because in winter, any additional light is welcome. Even more so when it is festive and comforting.