I could go either way on it - When I ordered my Xterra in '06, I went with the desert/graphite which is brown and dark grey. I loved the look of that. I don't have a good pic handy but this gives you an idea of what it looked like.
Saying that, We had light tan leather in my wife's XC90 and it showed dirt really easily - plus, our dog is black so his hair would show easily on the carpeting.
When we went with the Pathfinder, we decided to go with the dark grey interior and I like this as well. I have been really happy with the Nissan interior colors.