I think it would be really cool if TeamSpeak gave users a short tour the first time they start it. The tour could show how to customize and personalize TeamSpeak, not just the settings, but also the design. A lot of my friends only discovered much later that you can change the way TeamSpeak looks, and many didn’t really understand how much it affects the overall feel and user experience.
In my opinion, this is one of the biggest advantages of TeamSpeak compared to other voice platforms, and it should definitely be highlighted for new users.
Personally, I use the “DoA Theme Darker - Base,” and I think themes like this, which are already proven and popular, should be part of an official list and much easier to integrate.
