You can install new themes into Joomla and change the overall design of your website. The flash tutorial below shows how to install new theme into Joomla. Be careful that there are two versions (1.0.x and 1.5.x) of Joomla themes. 1.0.x version themes should be used in Joomla 1.0.x versions. If you use Joomla 1.5.x version, you should install a 1.5.x version theme.