Today is President's day, you wouldn't believe the number of US based businesses that are closed today, including the post offices, banks and courts. But like every year, Google does not show a logo for the day. Just like 2009's President's Day and 2008's President's Day, Google and Yahoo do not have special logos.
Here is the President's Day message from Ask.com:
And here is from the Search Engine Roundtable:
In addition, there are some complaints in the Google Web Search Help forums that Google China didn't have a special logo for the Chinese New Year.
Forum discussion at Search Engine Roundtable Forums.