Is there such a thing as thin travertine pavers?
A: 1/2 inch thick tumbled travertine tiles could be your best solution in this case. They are suitable to be installed on a concrete surface and they are very durable. Take a look at them:
http://www.travertinemart.com/products-page/ivory-swirl-premium-select-tumbled-travertine-tile/premium-select-french-pattern-ivory-swirl-tumbled-travertine-tiles