Templates & Themes
68KB uses a layered approach to its template system. .
Creating your own theme
All theme files are located in themes/front/ folder and each theme should then be inside it's own folder.
The only required files are a layout.php and a style sheet.
The layout.php file is basically a wrapper around the content. If you are used to working with headers and footers think of the layout as the header and footer combined into one file.
68KB uses a layered approach to its template system. This means if a file is not found in your theme it will pull the template file from the default theme folder.
Modifying a Theme
If you prefer not to create your own theme and instead want to use one of the ones included to work from then it is recommended to rename the theme folder to something different. This way when upgrades come out your theme files are not overwritten.