Google decided to promote their new feature to have a background image on the Google homepage with showing a photo for everyone today. If you have a Google account you can change the photo displayed.
If you actually want your white background back, international Google users are out of luck. There seems to be a bug.
I have tested it on the UK and the German Google homepage. You get the link on the left lower corner to remove the background image, but when you click it Google still displays the featured background image.
On the google.com homepage the "Remove Background Image" link works. When you click it you get your beloved white and empty background back.
Note: The Remove Background Image link only appears once you changed the image.
My suggestion is to use google.com until Google fixed the "Remove Background Image" problem on your country specific Google homepage.
Anyway, I think Google makes a mistake here to force users (see this comments of frustrated users) today to see a photo in the background, especially if there is a bug that prevents users from deleting the photo. It is already annoying that users have to have a Google account to change or get rid of the background image.
Google removed the special doodle early, because of user outcry. Quote from the Google Blog: "Due to a bug, the explanatory link did not appear for most users. As a result, many people thought we had permanently changed our homepage, so we decided to stop today’s series early."
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