I recently made a pseudo-wooden floor for my in-studio shots. It was cut out of a scrap 2x4' board, so it's a bit of an odd size, but you can easily modify the files. Finished piece is approximately 20x34" for the smaller scale floor and slightly smaller for the larger scale floor – this being so I could easily put the design on the back side of the same piece.
Works well for animation, illustration, and stock photography too :)
These files were created by myself, I'm charging nothing, so be kind and don't charge for usage either.