Today I have noted that like Bing, Google is now allowing the use of background images for customization of Google home page. You can see the link at the bottom left and click on it. Pop up window will open with many images. You can select one and fix it as a Google home page background. More options, whether you want to include images from your computer, Picasa album, or from a Public gallery. Later on, if want to remove the background image you can do so by clicking the option at the left bottom.

The idea Google got from Bing. On Bing, you can see the daily new photo. Google has inserted background images like Bing |

Google recommends the use of images that are wider than they are tall (landscape orientation). Background Images must be at least 800 x 600 pixels and in one of the following formats: .jpeg, .tif, .tiff, .bmp, .gif, .psd (Photoshop), .png, .tga,

Guide to Add a background image to your Google homepage click below
https://www.google.com/support/websearch/bin/answer.py?hl=en&answer=180720

It is known as the Freeze frame!