... when it comes to the usability (I have a bit the thought that my eyes now tend to give the big border too much attention, whereas the focus should be on the content, not the UI) , I would like to see this border reduced. I believe the border width of both the Member Card and Thread Previews for example would be a perfect fit. Like this:
Less stylish, but I tend to believe it improves the functionality.
Images taken from this discussion: http://xenforo.com/community/threads/who-else-loves-pop-up-overlays.10592/