Sometimes Google puts up images to "replace" their normal image...
Like the 5th anniversity one, the alligator one and so on..
Anyone collecting them? :-)
http://www.google.de/images/hp0.gifhttp://www.google.de/images/hp1.gifhttp://www.google.de/images/hp2.gif
__....................................http://www.google.de/images/hp3.gif