15 of the best Google logos

For over 10 years Google has periodically replaced it's regular logo with a unique themed logo to coincide with a special event or date. Here are some of their best. (You can see them all at www.google.com/logos)

Valentine's Day

Thanksgiving

Solar Eclipse

Beijing Olympics

Louis Braille's Birthday

The Large Hadron Collider

Anniversary of the first Laser

Halloween

Crop Circles

Mohandas Ghandi's Birthday

Albert Einstein's Birthday

100th Anniversary of Flight

Earth Day

Leonardo Da Vinci's Birthday

40th Anniversary of the first Moon landing