I was cruising the Dollhouse section at HobbyLobby and came across flooring vaneer. This stuff is paper thin, comes in mahogony, pine, oak, cherry, apple, and is about $15 for three 8x11 sheets. It is real wood in a expoxy composite, and although the planks are way too large, can be cut down to size or rescribed to fit your scale. I am experimenting with them now and really like the results. I also lightly sanded off the stain and am able to restain to change the color.
Before that, I have used teak, maple, apple, and oak vaneer, or as Jeff mentioned, Boxwood. Boxwood is by far my first suggestion for a beginer and this too can be bought in vaneer sheets. However, the thinner it gets, the brittler. That is why I have been experimenting with the composite vaneers.