It has been three years since Google changed their favicon to the multi colored icon we have today. But now we are seeing reports of some users reporting a new all blue favicon being tested by Google.
The image to the right show off the new all blue Google Favicon. You can see it at google.com/images/google_favicon_128.png as well, to prove this is something Google is hosting.
It looks the same structurally as the colored one most of us see today - but this is one is all blue. Here is an enlarged colored favicon:
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That launched in January 2009, between May 2008 – January 2009 we had the blue lowercase G, and from who knows when till May 2008 we had the classic G with colored box. Here is the history of those icons in the URL bar.
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I am not sure if Google will go all blue soon or if this is for a specific Google property only.
Forum discussion at Google Blogoscoped Forums.

Comments:
Karl
02/02/2012 06:46 am
Yeah, Google's recent behavior has been making me feel rather blue, too!
LB Olson
02/02/2012 05:31 pm
Hail the golden calf. I mean the blue google.
tce
08/13/2012 02:13 pm
It happened.
Guest
08/13/2012 02:59 pm
yeah just now mines a new one.
Marcus
08/13/2012 04:18 pm
Weird the old one looked like the Microsoft Windows flag and the move to a simple blue logo kinda makes me think of the new Windows 8 logo!
Varshini
08/21/2012 04:42 pm
weird... mine jus turned blue today
Robert Peterson
08/25/2012 05:30 pm
the blue one is so boring
White-Tiger
09/01/2012 07:04 pm
if u want your old back ;) https://addons.mozilla.org/en-US/firefox/addon/google-favicon-2009/