In addition to the 10 built in applications and the "Fab 40" that
were later released by Microsoft, there are some additional themes which
are available for Windows SharePoint Services sites.
These 10 Themes are designed as Visual Studio 2008 extensions for
SharePoint (VSeWSS). You can install the themese on your computer than
then create a WSS-based application using the template, and finally
deploy it to the SharePoint Server. You can download the Ten Themes for SharePoint in VSeWSS Projects from Microsoft.