CSS design for existing HTML

Please only bid if you have professional graphic design/artwork experience and an online viewable portfolio. I need a CSS stylesheet to make a web application look nice, clean and professional. The application will be used in a medical environment and is currently in the beta phase. You will get an application user and FTP access to the css directory in a testing environment. The HTML code is div based and all divs have IDs. I attached a sample page ([login to view URL] is the file to be edited). I will modify the HTML code if necessary. The CSS has to make the application look alike on IE5.5+, Firefox1+, Opera, Chrome and Safari. Please consider [login to view URL] for inspiration. I like the clean look and the striped pattern but dislike the black header. A second color besides green should be used (maybe a light blue for links...).