Admit it: You've taken key cards from hotels. Sure, Sometimes you forget to give them back, but other times, it's just a great memento. But you probably don't have more than Steve Rushmore, founder of the hospitality-consulting firm HVS, who has collected them for 30 years.

The cards serve as 2-inch-by-3-inch canvases for the corporate art of branding. Lately, they've doubled as ad space for everything from films to local restaurants. Check out a few of our favorites.
Westin Peachtree Plaza
The first hotel to install a recodable lock 30 years ago was the Westin Peachtree Plaza in Atlanta.
Aloft Austin at the Domain
Austin, Texas
Kimpton Hotel Monaco
Denver, Colorado
Costa Mediterranea
At sea
The Time
New York City
Langham Place
Kowloon, Hong Kong
Las Vegas, Nevada
Best Western Executive Suites
Pickerington, Ohio
NH City & Tower
Buenos Aires, Argentina
The Ritz-Carlton
Dearborn, Michigan
Four Seasons Resort Aviara
Carlsbad, California
Los Angeles, California