wood grain foam playmats might be just the thing. Each interlocking tile is 2x2 feet and you can purchase either 6 or 12 tiles ($21.99 - $42.99 on Amazon). Borders are included to ensure you get a finished look. The company says the product is made from non-toxic EVA foam and works best on non-carpeted floors.
For more design inspiration, check out our recent posts about stylish gray nurseries and cool built-in bunk beds.