At Google, every Doodle tells a story..
Here's some of the Doodles:
Mother's Day 2009
Florence Nightingale Day at UK
Samuel Morse's bday: the creator of the wire telegraph:
To mark the 111th anniversary of the Philippine Independence, this was on Google.com.ph page! Neat eh? Thanks Google!!
There's a lot more of them at this site: http://www.google-logos.com/