Suggestions on what to put on the walls in this space

Hi! Does anyone have any suggestions on what I can put on either of these walls to add something to the space, it’s quite plain and boring atm. The room is about 6m long and I’m not sure what style painting/prints would work here because it’s so long.

Right now we have a very beige colour pallatte with a bit of green but looking to add more colour.

Thank you!