Hello,
All our Templates should work with Kunena without issues. Only certain Templates we provide have ever provided styling overrides to Kunena but that doesn't mean it wouldn't function without the styling changes. The default Layout for Kunena should look good with most of our Templates but if you check out our Firebug Video Tutorial here:
http://www.youtube.com/watch?v=4kmZ9uQcA_cYou can see how to find elements of Kunena and modify the styling to each Template specifically.
-Mike