You can find any information about Google only on Google, how to add something and how to change something, below is a process to delete back ground image from Google.

According to Google:

Add and remove content: Set your background or theme
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Your 'iGoogle theme' is the background image you see behind the search box at the top of your iGoogle page. If the area behind the search box is white, you're probably using the 'Classic' theme. You can choose from thousands of themes submitted by artists, designers, TV shows, and people like you. If multiple themes catch your eye, no need to settle -- you can put a different theme on each of your tabs. Learn more about using tabs.
Changing your theme

1. Click Change theme from ... in the upper-right corner of the page (the link will have the name of your current theme).
2. Once you find the theme that you'd like to use, click its Add it now button.
3. Click Back to iGoogle home to see your page.

Theme settings

Some themes are customized based on your location, the time of day, and other pieces of information that you may choose to provide. For example, some outdoorsy themes are sunny during the day and dark at night. So, to make sure the theme gets dark when it's dark where you are, we may ask you for some regional info such as your city or postal code.

You can change or update any geographical information you provide on the iGoogle Settings page. Here's how:

1. Make sure you're on the tab you want to edit (click its name).
2. Click the down arrow next to the name of the tab.
3. Select Edit this tab.
4. In the 'General' section, use the drop-down menus to change your geographic or language information.
5. Click Save when you're done.


If you are determined to be using Google.com and you just don’t want the custom background pictures, well, just customize it to a white background!

* Click on the “Add background image” link on the lower corner of Google.com
* Select “Editor Picks” from the list on the left of the popup
* Scroll to the bottom of the list and select White as a color

Keep in mind Google’s random whacky background picture changes will stop changing themselves on their own in 24 hours (supposedly).




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