Can you buy carpet samples to take home and try in the space and test the different shades of colour available in the limited hallway light etc?
My husband seems to think you can't get them, but if you can with tiles why not with carpet?
I'm currently painting the hall and am deciding between two shades for the bottom half of the wall, and suddenly thought the one we like most may like a bit wishy washy depending on the carpet.
We know the carpet we want, it just always looks so different in a showroom.