There is a HUGE VARIETY of themes for different kind of (countless) websites and blogs.
Most of them are localizable or translation ready.
The frontpage can be very simple with a list of recent posts or only a simple page. However, the home page can be very complex with lot of elements like the front of a newspaper.
The navigation is done through menus that are made with a widget or the recent template tag: nav_menus and menu family tools.
xili-language plugin provides multiple ways for webmasters to built a multilingual website. Some are very simple (widget, plugin settings,…) and some need a little knowledge in PHP coding to add functions and template tags in theme files or via child theme. For experts, xili-language is also pluggable.
In order to help webmaster, some free examples are detailled in forum and in websites. Example themes like twentyten-xili and twentyeleven-xili are presented on our web sites. ( http://2011.wpmu.xilione.com/ )
Professional xili-language premium services:
XiliGroup offers a premium service with attractive fees, delivered with an example of theme (twentyeleven-xili-nn) (nn is the suffix of the client). So it is easy for the webmaster to adapt his own theme with this example by copying parts.
In some cases, the webmaster won't use php but a theme framework (with UI settings and wizard) made by another developer. After an analysis step, xili-language premium service includes an add-ons plugin to fixe and improve the multilingual behaviour of the website without modifying the theme framework code.