Plaster Elements Plaster is at the heart of what we do - over the last 30 years Parsiena Design has amassed an extensive collection of molds and keys. If you cannot find a specific trim or crown cornice moulding in our catalogue chances are it doesn't exist! Adversely you may have a moulding in your home that you'd like to match; simply provide us with a sample and Parsiena Design will make a custom blade.