For Valentine's Day, Google prepared some special logos and design changes. Here's the kitschy Google Docs with custom icons and a prominent "Happy Valentine's Day!" at the top of the page (it reminds me of Slashdot's pink theme for April Fools' Day 2006: OMG!!! Ponies!!!).
There's an interesting doodle on the homepage:
...and YouTube has a commonplace logo:
Over the years, Google changed its logo and even linked to a Java animation. Last year, Gmail removed the invitations and Google surprised everyone with a doodle that seemed to miss a letter.
If you spot something different with Google's sites today, post it in the comments.
{ Thank you, Ilya and Nathan. }