We have a Bible timeline on the center 1/3rd of the hallway. Our second floor hallway is long and narrow so to do the entire wall would have been way too much. This works well.
We also have a fabric covering on one side of each door with the name of the "Workshop" on it and some decorations. And, there is a small banner pole with the name of the workshop written on a fabric piece above each room.
Have fun.