How about a new door?
One of the latest trends in not only residential construction but commercial construction as well is the sliding door, a.k.a. the Barn Door. They come in all shapes and sizes and can be adapted to any situation. You can even take a antique door and add a bit of hardware to give your space an historic feeling. Not only can you get doors of various shapes and sizes but the tracks and rollers are available in different styles as well.