Do a search on Google and you could find quite a few results. Here are some good free templates I like.
I agree with rahulkr: http://templates.joomlaya.com/ . 586 templates at the moment, all with live demos.
Theres a load of templates at www.joomlaos.de - not always the quickest site but you can see a preview of the templates. They then link to the preview site at www.joomlademo.de which is a lot quicker but you don't get the nice previews. Sorry for the lack of live links..
why use a template why not create your own in photoshop and then use the joomla plugin in dreamweaver to load your modules where you want then by doing this you can set your css and have a unique template, to many people use templates these days especialy with joomla and i have now gotten to the stage that when i go to a site that is jommla created it sticks out like a sore thumb
you might try this joomla24.com/remository/Download/Templates_for_Joomla_1.5.html alots of free joomla templates is available. Rate my reputation if this help you.
too many developer will give you free template for joomla, you just need search its at google or joomla offcial site