I have always been a fan of "The Last of Us" and in particular the bare, clean and raw quality the UI possesses. These 3 qualities I attribute not just to the visual, but also to the very handling of the UX itself.
I was encouraged to put my own take on the UI and I did so in the form of a proposed MEMO PAD system...something which I had always wished was available in-game as well. I started off with my usual napkin sketches and from there it took a life of its own.