I came across these amazing faux agate walls by designer Susan Jamieson of Bridget Beari in the 2012 Richmond Show House via The Scout Guide. Combined with an amazing painted floor, this is drop-dead, high end gorgeousness.
Love Susan's choice of a glass railing to keep the views open.
Braid trims out the room and an antiqued mirror door is covered in fabric adorned by a P.E. Gueirin acrylic door handle.
Here's a behind the scene of how these walls were created by Jeff Ragland of Holtz.  The custom shelves are painted in Pickle No. 37, part of her custom color line for Fine Paints of Europe.