Google showed up 5 steups of building in logos in past days in holidays here is te link if you didn't notics

http://www.google.com/doodle13.html

If you want to have a look at other google logos wich they used on different past occasions here is the list

http://www.google.co.uk/doodle2.html
http://www.google.co.uk/doodle3.html
http://www.google.co.uk/doodle4.html
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http://www.google.co.uk/doodle12.html

have a look