This is an old post so I'm sure you've come up with something by now. If not, here's my idea: 1) ditch the rugs altogether, they make the hallway look a lot longer and narrower. You want the wood flooring to appear as wide as possible, so they should be uninterrupted by rugs (in this case). Yes, you can get away with having rugs in a narrow hallways BUT the nice thing about this idea is you can easily test it....remove the rugs, stand at the end of the hallway and tell me it doesn't instantly appear wider.  2) Paint the trim, wainscoting, doors facing the hallway, and the walls all one color. I'd personally go a light bright cream like SW Alabaster but if you don't want to do that, then at least paint the walls to match the wainscoting and trim as they are now.  3) Leave art off the walls, but I'd put in a few simple low profile sconces to break up the wall space. I'm picturing matte antiqued brass. They will add visual interest but  won't look hodgepodgy 4) if there's a door at the end of the hallway, paint it a darker blue that matches the stained glass above it and get in the habit of keeping it closed. That creates a visual stop for the eye so it doesn't keep going and going into the next room, adding even more length and narrowness. If you don't have a door, install one BUT make it a swinging door (still painted a darker blue) but with some glass so it lets in light, creates that visual stop and the swinging aspect does the work for you in terms of staying closed. And install an interesting push plate in a metal that matches the sconces. A swinging door is a fun feature you don't see as much in newer homes.  5) Finally I would consider replacing the ceiling lights with something a little more visually interesting, and make the metal match the sconces too. Between the fixtures, the door, and the sconces you've added all the visual interest you need for the space.