Yes, you can change background, Text & entire look of Orkut. Any way orkut is not giving you this option. First thing you need to have is most popular web browser in these times Mozilla Firefox. If you still don’t have FireFox just get it by clicking on ad @ end of this page. Firefox allows you to install extensions & plugins to enhance user experience. To change the look of Orkut you need to have an extension “Grease Monkey”.
Install it by clicking here. After installing all the requirements mentioned above install scripts to GreaseMonkey.Scripts are available at Devil’s Workshop . GreaseMonkey is a FireFox extension which allows user to change look of any web page.
Related Link: http://www.insideorkut.com/2006/06/changing-your-orkut-background.html
You can send a scrap to all your friends at Orkut
More Details Here