Orkut implemented the diwali theme for a very short duration and that too was restricted to Indian members. This theme is not available on orkut now. If you are wondering that you will have to wait till the next diwali to enjoy the Orkut Diwali Theme, then here is some ‘expected’ good news for you. Here is a userscript for the diwali theme so that you can use it even whenever you like.
» Instructions
This hack is not compatible with Internet Explorer since it uses Greasemonkey, a Firefox Add-on. If you want to enjoy this and countless other hacks then Switch to Firefox.
- Install Greasemonkey extension for Firefox – Click Here to Install (or Read More)
- Install Diwali Theme | Alternate Download (problem?)
» Credits
This userscript has been created by Mr Nobody
Gaurav Dua – Orkut Guru – 546 Points 
22, Webmaster and Businessman. Based in Jammu, J&K – India
Gaurav has written 514 Articles, posted 323 Comments.
hey y is this orkut diwali and orkutblack theme not installing please tell me