This board uses the most frequent version of phpBB (3.1) which might mean that some mods might not work - but they'll be updated pretty soon (3.1 was only released yesterday). If there's a 3.0 mod/style you really like I'll definitely try to install it and see if it works.
Links: phpBB 3.1 extensions (until 3.0 it was "mods", now called extensions), phpBB3.1 styles, phpBB 3.0 styles.
I've installed PBWoW, which is a phpBB style for Blizzard games - you can activate it in your profile, but I don't wanna set it as default as it looks like the official forums. And let's be honest, who'd want that.
