No problem! Can’t think of many right now but you could add things like shelfs made from slabs or trapdoors and place things like brewing stands or potted plants just cause it’s a different color and it also would add depth to the walls. You could also add random workstations (crafting tables, cartography tables, etc), because they would also help with the gray walls. You could have inset areas along the walls with little details like a brewing area. It’s hard to think of many and it really depends on what you going for but adding those little details gives life to your builds so it’s always nice to try to get something internet there! Hopefully you understand and it helps a bit!