Take a look - we just started building some examples of CSS driven RTD Catalogs. By using the RTD Catalog, your website is always in sync with your RTD products, including live pricing tables, instant pricing and more.
Simple changes to these files can result in dramatic changes in the look of your site.
These first 7 examples show what can be done with the side menus using 1) color boxes and borders, 2) bitmap images for buttons and 3) image slices. These three simple methods make up 90% of the side menus techniques we've seen.
http://www.realtimedesigner.com/css/css_samples.html
More to follow.
Mark