Which window treatment serves as a decorative finish for the top of a window?

A cornice or valance is specifically designed to act as a decorative finish for the top of a window. These treatments not only add a stylish element to the overall decor but also help conceal any hardware, like curtain rods or blinds, creating a more polished and finished look. Cornices are typically structured, often made from wood or upholstered materials, while valances can be fabric pieces that drape elegantly across the top of the window.

In contrast, wooden blinds, sheer panels, and roller shades serve different functions within window treatment design. Wooden blinds are primarily functional for privacy and light control, sheer panels are used to filter light while still allowing visibility, and roller shades provide a simple and modern option for blocking out light. None of these options are designed primarily for decorative purposes at the top of a window, as a cornice or valance is.