It's probably worth pointing out that making a JqueryUI theme is not hard. What's hard is the actual design - ie colors used and so on. Once you have a design cloning it for Jquery UI is trivial.
While one can look to other systems for inspiration, it's not possible to just make NetTalk apps work with a Jooma theme. That's because those themes simply don't cover all the things wee need, and they're designed with a specific set of HTML in mind.
In other words the CSS follows what the framework _does._ Not the other way around.
Unfortunately most CSS is designed for static sites, not web apps at all, so it's good for inspiration - but less useful for "plugging in".
cheers
Bruce