Ubuntu Lucid Lynx 10.04 is not scheduled to release until late April 2010, however, there are several people who are eagerly awaiting for the next release of Ubuntu. If you are one of them and also use Google Chrome, here is a Ubuntu Lucid Lynx theme for you.
The background of the theme uses the theme from Lucid Lynx and also changes the colors to the one’s used by Ubuntu. Theme installation is easy, just download the Theme file from here and install it. If you are looking to revert back the theme to the default one, just go to "Options -> Personal Stuff" and click on the "Reset to default theme" button.