Note that this site is for Themes for Tiki 13 and later. If you are looking for the Themes sites for Tiki 12.x LTS version, please visit http://oldthemes.tiki.org. Most of the content of this site, such as the themes shown, isn't yet updated for Tiki 13.
As of the release of Tiki 13, the package includes these themes:
Literally any Bootstrap 3-compatible stylesheet can be used to style a Tiki 13 web site, so the above themes are only a starting point.