http://www.se-uiq.com/themes-p990-eng.htm and look for Vista 1.4 theme.
Download the file to your pc, then copy the *.utz file to your memory stick, open file manager and tap on the file. It will then ask you to install it...
With the Vista 1.4 theme, you must restart the phone after installing it - my menus looked all 'garbled' just after applying the theme.
Enjoy. 😊