Paint a large room to look like a cave.

Colored like rock, but with gold sparkles. Like the wall and ceiling of the attached picture. The room I want painted has 2 different ceiling heights. One part measures approximately 14' 5" wide x 13' 1" x 8' high. The other part measures approximately 14' 5" wide x 7' 8" x 11' 8" high. So there's also a "wall face" that is 14' 5" wide and 3' 8" tall where the two ceilings "meet" if that makes sense.