If you visit Google.com today you may see a Google Doodle (logo) for St. Patrick’s Day. Here is a picture of the special St. Patrick’s Day Doodle for this year:
Google is not the only search engine with a special logo. Yahoo, Bing and Ask.com all have logos.
I have some additional logos from others in the industry at the Search Engine Roundtable. Also, if you want to see the St. Patrick’s Day logos from the past 6 years or so, you can see them at 2009, 2008, 2007, 2006, 2005 and 2004 archives.