Except for the spreading juniper of some sort behind the rock garden, there isn't enough detail to say what any of them are. It would help if you would tell us where the pic was taken as well, besides closer up pics.

As Leftwood said, very difficult to tell. I do think there might be some Artemisia schmidtiana (silver mound) in there, but I'm not sure. Instead of trying to choose the same plants as the picture, I would suggest that you go to the library, a bookstore, or a home improvement store and look at books and/or magazines with rock garden pictures--they will list the plants in the garden, and often will have a list somewhere in the book detailing zone, sun and moisture requirements.