is it possible to use more than one theme on a xoop site. I'd like to implement different themes to different areas of my site
cheers

Yes, you can use as many themes as you want and have them change automatically according to which module is displayed. Either use the theme changer module or this script in a php custom block;

$GLOBALS['xoopsConfig']['theme_set'] = "theme_name";

change theme_name for the alternative theme and place the block VISIBLE and without a title to show in the module(s) that you want this theme to change for.

This Q&A was found on XOOPS Web Application System : https://xoops.org/modules/smartfaq/faq.php?faqid=512