An adaptation of the Fluid Index theme done originally for WordPress blogs is available now for Tiki CMS/Groupware. The theme is another one using the *litecess layout method. It features some neat styling details on blog pages in particular. The theme files can be downloaded from this site; the current version has been tested with Tiki up to version 220.127.116.11.
The Fluid Index theme uses Tiki's Site Identity feature to display the site title and specify the menu id number. A banner ad can also be placed at the page top as a Site Identity option. Please report any problems in the forums here.