Ah, I thought I was the only one to see it and that it was a new spy function of Google which detects which pages you visited most and change the Startup page logo according to your detected interests...
> Subject: google
> From: firstname.lastname@example.org
> Date: Wed, 23 May 2012 09:09:58 +0900
> To: Loopers-Delight@loopers-delight.com
> Google has a nice retro/analog startup page today.