I was working with another designer a while back, who brought up the use of a collage of images to help set the mood or tone of the game. I can't recall what on earth the term was, but if felt helpful. And I'm readdressing my GDD designs now and I want to review this as an option. I just don't know what to search for and my attempts have been futile.

Anyone here know what I'm talking about? I certainly don't. :D