Today on the Google's home page is a special logo for both the Spring Equinox, the first day of Spring and the first day of Fall in the southern hemisphere. The logo has a mouse picking a flower after spring has sprung, relaxing the rest of the day. While the Southern Hemisphere logo has the mouse keeping warm.
Northern Hemisphere Google Logo:
Southern Hemisphere Google Logo:
Here is Bing's home page:
Here is our theme for the day:
Here in New York it doesn't feel like Spring just yet - although I fly out to SMX West today and I am sure it is more Spring like there.
Forum discussion at Google+.