The Subway restaurant in Rittman, OH (population: a few thousand) has enormous black-and-white historical skyline photos of some really big city (might be NYC, not sure) covering all the walls from floor to ceiling.

I’ve seen a restaurant that served (Americanized) Italian food, but the decor was decidedly Early American. This was in Ohio, so really neither of those things would generally be considered foreign. I found it slightly odd, but at least the decor was consistent with itself.

Sometimes you’ll see things that don’t seem related at all, like mechanical stuff on one wall and vintage glassware on another. In extreme cases each thing on the walls seems totally unrelated to most or all of the others, e.g., you might see a tin washtub, a mosaic depiction of the Acropolis in small ceramic tiles, a summer-camp T-shirt, a lobster trap, and a garden rake, all on the same restaurant wall. I just made up this specific example out of whole cloth, but I’ve seen restaurant walls that were just about that mixed up.