DESIRABLE Plantation shutters have always added class to the finest homes . . . a signature of elegance and tradition. But quality interior shutters are practical, as well. They can flood a room with sunshine, plunge it into darkness, or admit any degree of light in between. Unlike blinds and curtains, shutters are a permanent improvement to your home. Shutters are the only window treatment option that is a true investment in your property, the value of which can be included in a mortgage and resale appraisal.