I would just get some very large, over sized art in a modern style. If you're trying to get some function out that space, you could get a skinny console table. I obviously don't know what that is a hallway to (or from), but I like to put bookcases in hallways. People always say there isn't room, but there is. I like it when there are items in a long hallway that make you "meander" through it, it helps to break it up if there are actually things that you have to weave your way through. You can always put a bench in a hallway as well.

You can try decorating with framed pictures, decal stickers, or some really nice art pieces.

How about a long persian runner?

I don't think art has to be particularly cohesive. Buy things you like.

Start with some MCM semi-flush lights for the hallway.

https://www.houzz.com/products/midcentury/lighting/query/semi_flush/nqrw/p/36

I would do alternate between gallery wall of small prints / photos and large pieces of art