Kelly Porter This looks like a Venetian plaster decorative wall finish (or wallpaper). However, a close color match is Creme Caramel OC-84 by Benjamin Moore.
HartmanBaldwin Design/Build You are right! It's polished venetian plaster and had a custom color mix that was used through out the home. If you want to achieve this look I would recommend calling a professional who has extensive experience in this type of finish. It's not an inexpensive project but the look and feel are very luxurious. If you are on a budget, find a talented painter who can mimic the look.