Theme Designs
The only available theme design is the "Default" template (you're looking at it now).
We've just completed a theme design contest and are currently judging the entries.
Theme Pack
We have prepared a zip file with the Default theme as rendered HTML (example.html) and a YikeSite version ready to go (template.yike). We suggest you create your design using the example.html and when you are done with all your formatting, move it into the API version using template.yike as a guide. When you're done, you can copy/paste your code into the design section of your YikeSite admin panel.
Download the theme pack to get started.
Theme API
Build your template dynamically (headers/footers/navigation). Check out the Theme API.