I can't really vouch for it, but there's a game called "Blindside". It's basically an audio-only adventure game.
Also, Hero Core springs to mind - it's just pure black and white, so there's a lot of contrast between the background and foreground. I can definitely vouch for that though - I played it a few years back and really loved it.
Unauthorized Game Assets: Games that use the assets of existing games without permission, including music, graphics, characters, designs, etc. User-generated content does not qualify games for this concept.
Copyright Infringement: Games that are confirmed cases of copyright infringement based on legal terms. (I believe Great Giana Sisters qualifies, as does Tear Ring Saga, which Nintendo sued over for copyright infringement and won on an appeal, in my understanding of the court case.)
You probably noticed this page because I just edited it. I added Banner Saga to the list; this is one of the Banners you can choose from:
Was there any court case in relation to Giana Sisters? Also, I don't think it directly reused assets. Although, I do believe that there was a version of the original Giana Sisters that did replace the sisters with Mario and Luigi.
Anyway, Unauthorized Game Assets seems like a good name for a concept - it's very clear as to what it means. Whatever happens though, stuff relating to things that can be made via user-generated content shouldn't be acknowledged in the wiki. Technically the banner above was user created, but it was created by a backer and officially put into the game by the developers.
I keep tossing up between 1 and 2 - 1 is the better horror game; the presentation of 2 was better. I think ultimately I'd have to go with 1 - I mean, I ended up playing through it three times. Actually, I think last time this topic came up, I settled for 2, oh well.