The template and its associated files provide the visual ‘look and feel’ of your web site and are maintained separately from the web site content which  is stored in a MySQL database. The purpose of the template is to isolate  the  appearance of the content  from  the content itself, as well as the  programming layer from  the presentation layer.

A typical Joomla! 1.0.x installation comes with two templates pre-installed .There are plenty of templates available in the market both commercial and open source.Snek.gr  offers 2  open source templates families : athena series (4 templates) and apollon series (4 templates). You can preview them at  the demo section and download them at the download section.