I bought these Pottery Barn shelves for a steal at a garage sale last summer. There are 8 units in this picture, but I only have 5. I think it'll be a perfect use of space in this wide hallway.
The brown under the stair treads will be painted white and I think I'm going to number them in a really faint color. Ideally, a stair runner would be great, but I don't think we have the money for that now. We still need to order the sheet metal to go in between and then will trim out the border and add a handrail to finish it off in between the beams.