"Since 2002, Google has honored 25 historical people with custom-made versions of the Google logo, displayed for one day on the Google homepage."

All 25 logos with summaries listed at
http://royal.pingdom.com/2009/01/02/25-amazing-people-celebrated-by-google/

How many of them do you remember? I can remember Munch, Braille, and Magritte, but I prefer Firefox's Google start page...