Well, I don't allow users to select styles on my board. Each category ties into a site with its own layout, thus each category has its own layout that blends it into the site.
www.lmalla.com and click on the Everquest logo for an example (It's the only one I have public atm). Click on forums and you'll see what I mean. When you click on forums, you're looking at a category under forumdisplay, not forumhome.
Also the news on that page is with your hack, though I have the style hardcoded in the templates atm.