Hmm, I wrote a whole answer, then realised you specified borders, not black bars.
You could use permanent borders/frame, but most of the games that I've seen using a frame, had the UI integrated into it, all the buttons (journal, character,etc).
Some more info could help us give you more opinions, like, what engine/program, what theme (sci-fi, fantasy, etc), but in general I've seen borders with UI buttons on them.