Installing Orkut themes in Opera is very simple because you do not need to install Greasemonkey.
Follow the steps given below:
From our website, first click on the download link for the Orkut theme that you want to install. Some text will be displayed on your screen. In Opera browser’s menu, go to File —> Save As. Do not change the default file name and file type. Save the downloaded file in a new folder, say for example, ‘MyOperaThemes’.
Now login to your Orkut account and you will be able to see the new Orkut theme installed.
How to manage Orkut themes in Opera
In Opera, there is no option to manage your Orkut themes. So keep only one theme which you like, in your ‘MyOperaThemes’ folder. That will be the theme displayed. Keep all the other themes downloaded earlier in some other temporary folder, so that you can use it later, if required.