Google has added an option to change the background image of its search page. If you have a Google accounts Id, you will be able to change the image. Right now this option is available only for google.com not for the country specific sites like google.co.in or so.
To change the background image,
– Sign in to your Google account.
– Go to this link
– Navigate to left bottom of the search page, click on the link
– Select the image from the Google gallery or from the Computer
Background image will be set your Google search page!