The Search Engine Roundtable SEO forum points to Microsoft's search engine Bing as being the first to post a logo or theme.
Check this out by clicking on over to Bing's homepage, which
celebrates the beginning of Chanukah. There you will find answers to such questions as why a menorah has nine candles, and where the final torch lights the first giant menorah candle in Israel's torch
relay.
Read the whole story at Search Engine Roundtable »