Google has a big history that started on 1999 and is related to changing its homepage logo to match a specific theme, it can be:

• a season like Christmas
• birthday of a famous artist
• national holidays
• etc

The designer that makes these pieces of art is Dennis Hwang who works at Google as the International Webmaster. Anyway, the following list is what I consider to be the top 15 google logos since its creation to this date, they are not listed by quality but you can comment and say which is your favourite one.

Louis Braille’s Birthday – January 4, 2006

Inventor of the world-wide system used by blind and visually impaired people for reading and writing

World Water Day – March 22, 2005

Einstein’s Birthday – March 14, 2003

Thanksgiving – 2000

Dilber Google Doodle – May 20, 2002

Vincent van Gogh’s Birthday – March 30, 2005

Summer Games in Athens – 2004

April Fool’s Day – 2000

Independence Day in the United States – July 4, 2001

Picasso’s Birthday – October 25, 2002

100th Anniversary of Flight – December 17, 2003

Korean Liberation Day – August 15, 2001

Vote in Presidential Election – November 2, 2004

Edvard Munch’s Birthday – December 12, 2006

Google Beta – 1999

That is the top 15 list but there are still 2 honorable mentions, one of them goes to the Google Lunar Office prank on 2004 on the April Fool’s day in which they were interviewing candidates for engineering positions at the lunar hosting and research center.

The other respectable mention is the logo used on the Andy Warhol’s Birthday (August 6, 2002), the blue + yellow + pink + green combination is a killing that probably hurt the eyes of many googlers.

There are more Google Logos at their official page.

For your viewing pleasure, here is a time lapse video that shows Chief Google Doodler Dennis Hwang drawing a Google Doodle from start to finish.