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Cornices Cornices are horizontal moldings that extend a little away from the wall to the ceiling, they crown the wall. Cornices can be made of various materials, including plaster, wood, metal, or synthetic polymers. Cornices can also be decorative or functional. Cornice The most common type of cornice is one that is made of plaster. Plaster cornices are often ornate and can be very detailed. Cornices can be painted or left in their natural state. Regardless of the material that they are made of, cornices are a great way to add detail and interest to a room. Cornices can also be used to conceal the joint between the wall and the ceiling or to house lighting fixtures.