In part, it would depend on what kind of room you're putting it in.
For a kitchen/dining area, the caf?-curtain wall would look nice. Upstairs, as a penthouse-style apartment, the cityscape wall.
Exquisite or gorgeous walls would look great for a study/library/upscale living room. The mortar wall (Savanah) could help make a basement look mysterious.
I would probably stay away from really light, poppy wallpapers, but sometimes you just have to put things up and see how they look. I usually try to live with it for a few days, to see if I really like the combination or not.