I remember the dollhouse my grandmother had when I was a child and I'm pretty sure it had tiny stripes for the wall paper. I think that's probably the best solution for people who don't want to be too innovative with their choice. It's nice and simple, easy to line up and will go with a lot of things, especially if you get it in neutral colors.
My grandmother had small blue and silver stripes in most of the rooms I think and even had a tiny blue and silver arm chair to go with the paper.
I think you might be able to get away with other kinds of doll house miniatures if you planned carefully though.