The Ornamental Stone Wall is a beige-grey-colored building-block divided into 4 quarters with chiselled squares in them on all 6 sides. It can be crafted in your Crafting Menu (default key "Q") or at any Crafting Table in worlds created before R22 on September 16th 2015, after the recipe has been unlocked upon buying it in the Store as a part of the "Decorative Stone Pack" (as of R24 in November 2015). To craft 8 (blocks of) Ornamental Stone Walls, you'll need (as of R24 in November 2015):