This is very interesting google trick. You can change the google background image. This is offered by google itself.
- Visit Google.com
 - You can see at the bottom as “Change the background Image”
 - Click it and sign in to your gmail account(if you already login then it is no need)
 - Google provides some public photos.
 - Why not you can upload your own photos or can select photos from picasa.
 
Enjoy the google search engine tricks.
The image size should be larger than 800×600 .
Your little comments will motivate me
you can remove the image and fix another image also.

















