The US Hawks forum can use different styles for different subforums. I'm still trying to decide which styles to use for which kinds of subforums, but I'm pretty sure that I'd like each Chapter to have their own distinctive style so people visiting will know when they've moved from one domain to the next.
Right now the SW Texas Hang Gliders is using the default style (prosilver), but you can see more styles at the styles demo page: http://www.phpbb.com/styles/demo/3.0/. If you go to that site, you'll see a drop down box in the upper right corner that says "Select style" in front of it, and it normally starts with "prosilver". You can click on that drop down box to select another style to see what it looks like. I generally like styles that scale with the browser window as its size changes. Otherwise, with a fixed-width style, it might appear too big on some people's screens and too small on others. You can test this by resizing your own browser window and seeing if the width of the forum itself changes as the window size changes.
There are dozens (if not hundreds) of styles that people have developed, and there are new ones coming along all the time. It takes a little work for me to install each one, and a little more work to add your club's custom logo, so I don't want to do it too often. But if you see something that you really like, please let me know and I'll get to work on it.