Google's blog recently posted (http://googleblog.blogspot.com/2005/12/tis-season.html) about putting up christmas lights. It mentioned searching about 'special days' in December, but I was unable to get anything from those, besides "christmas". But if you search for "christmas lights", instead of the usual candy cane, you get christmas lights!

You can also type "chanukah," "hanukkah," or "menorah" to see candles in the advertisement space. If you search "kwanzaa," you will see the same candles, but colored black, green, and red.