Thank you, Karena! I love this garden too. For the patio we used a limestone from Salado Quarry in Texas (http://www.saladoquarry.com): this product is their "Sonoma" squares and rectangles with a tumbled finish, in "Cream" color. A similar product was used on the face of the walls.

Thank you very much for answering my question :-). I appreciate it! It is a very lovely garden and beautifully executed!