The site design in Tiki is controlled via styles and themes, many of which come bundled with the software.
When designing your site, please consider using a user-centered design approach to best satisfy the primary needs of your audience.
Themes.tiki.org
Themes.tiki.org is a resource, download and discussion site for Tiki theme designers. It contains new themes available for download, instructional content, forums, and ways to contact experienced theme designers.