How to Make Cornices the Width of the Bedroom

Measure the length of the wall where you want the cornice. Subtract 1/2 inch. Cut two 1-by-6-inch boards to this length using a table saw.

Place the end of one board over the top side of the second board. Drive finish nails through the side into the end of the board every 8 inches. Lay the cornice with one board flat on the floor when you are finished.

Place L brackets every 3 to 4 feet along the inside corner of the cornice. Screw the brackets to both pieces of wood to create a secure attachment.

Cut quilt batting 5 inches longer than the wood and 18 inches wide. Center the wood on the batting. Wrap the batting over the sides of the board and staple the batting to the underside. Keep the batting smooth and slightly stretched on the outside face of the boards. Trim off excess fabric. Repeat for your decor fabric.

Move a stud finder along the wall 4 to 6 inches above the top of the window trim. Mark the location of each stud. Draw a level guideline across your marks at the height you want for the cornice. Screw an L bracket into the wall stud at your line. Use two screws and one bracket for every two or three studs.

Position the cornice on the L brackets mounted to the wall and screw them into its top underside. Add an L bracket on each end of the cornice to the adjacent side wall. Use wall anchors if you don't screw the brackets into studs.