Astun supply a whole range of Print Templates by default but you may wish to create your own. The default Print Templates may be found in the WebApps\WebService\print\templates folder and these are the ones that are displayed in the Templates selection in the Print Options for your Print. If you wish to create your own custom templates then these will need to reside in the WebApps\WebService\custom\print\templates folder.
Below we have the A4-portrait.html which is a Portrait template for printing to A4 size.