Determine the style and shape of your cornice boards. Search magazines or the Internet to gather ideas.
Measure the length of the window using a steel tape measure to determine the length of the cornice.
Measure the depth of the outside window casing using the steel tape measure.
Determine the depth needed for the cornice. If the cornice will not cover draperies, add 4 inches to the outside casing measurement obtained from Step 3. If the cornice will cover draperies, add 10 inches to the outside casing measurement.
Roll out the butcher’s paper on a flat surface. Use the steel tape measure and a pencil to mark the length onto the butcher’s paper needed for the cornice board.
Sketch out the design with a pencil onto the butcher’s paper for the cornice. Include the depth measurement when sketching your template.
Cut out the template with scissors.