I know this has been overdone in some cases over the years, but I think if they are carefully chosen for uniqueness, this look still has a lot of mileage. It would also be fun to choose them based on your own travel destinations as a memento, or places you haven't been to...YET. :)
Take a look at some of my favorites I found on eBay:
What do you think of vintage travel posters?
Would you use them in your own home, or for a client's home?