Unless you haven't done a Google search today (which is highly unlikely), you've probably noticed that Google now has new favicon.
The new favicon kept the lowercase g as the main element but used all colors from Google's logo -- as opposed to the more conservative one it succeeded.
Quoting Marissa Mayer, VP, Search Products & User Experience:
"Back in June, we rolled out a new favicon — the small icon that greets you when you access Google on your URL bar or your bookmarks list — and we encouraged our users to submit their ideas for this important piece of Google branding. We were impressed by the volume of submissions we received, and today we are happy to introduce a new Google favicon inspired by those submissions by our users. André Resende, a computer science undergraduate student at the University of Campinas in Brazil, submitted the design that inspired our new favicon: . His placement of a white 'g' on a color-blocked background was highly recognizable and attractive, while seeming to capture the essence of Google."
Courtesy of http://googleblog.blogspot.com