Here are some more themes from google:
http://www.google.com/Easter/feature_easter.html (catch the eggs)
http://www.google.com/heart/heart01.html (click and hold on the heart)
http://www.google.com/heart/feature_cons.html
http://www.google.com/mentalplex/

Images:
http://www.google.com/holidaylogos.html
http://www.google.com/unclesam
http://www.google.com/microsoft
http://www.google.com/mac
http://www.google.com/linux
http://www.google.com/bsd

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