It is not the same if you collect salt and pepper shakers and they are all of a different color and size. Mass all of those together and it will just look like a mass.
Notice that the rooms are almost all white. They picked one color of the ginger jar. The drapery in the one room is the blue of the ginger jars. In other words, they made the collection the focal point of the room and the room's style and color revolve around that alone.
If you have a collection of like-colored, like-proportioned items, mass them together and get great decorating impact from them if you let them take center stage and let the rest of the room quietly complement them.