For anyone interested, I've attached to this message a theme for Moodle 1.1.1. The theme (still under development and test!) has been obtained editing the following files in the themes/formal_white folder:
The themes allows the use of two logos, one bigger for the home page and one smaller for the other areas of Moodle. There are no sizes defined for logos in header.html so the size can be modified as needed.
In the .zip file I've also added the file formal_swatch.jpg wich contains the colors used along with the CSS classes impacted.
There are several things to be tuned (especially cross browser compatibility), so if anyone could be interested in using and testing the theme, the feedback will be greatly appreciated.