From a Sacred Cactus and the Blue Birds of Happiness to fruit salad Jesus, Slate has an awesome slideshow featuring Christmas light displays from around the country. I'm particularly shocked at how many folks used their displays to make some sort of asinine statement (really? an oil derrick?), but they're all interesting.
I think my favorite, despite its message of snotty atheism, is the Flying Spaghetti Monster, picture above.