A decorative device, such as a cornice, for crowing a variety of architectural structures also having modular and interchangeable components is disclosed. In one embodiment, a cornice comprises a horizontal base unit having a face section, a top and a bottom, and one or more interchangeable decorative modules. A decorative centerpiece for the cornice is also disclosed. Additionally, the disclosure includes novel means for attaching particular components to one another. In the preferred embodiments, the components are wood.