Decide on your fabric. Bed sheets are an easy option. They are prehemmed and will coordinate with the bedding. Use one flat sheet for the back of the crown, one flat sheet cut in half for the two sides and a pillow case for the front or valance part of the crown. Ready-made curtain panels are another option and provide a vast array of fabrics to pick from. Or visit a fabric store and select the unfinished material of your choice.
Find a wood circle. Many home improvement stores carry round wood circles in different sizes. For a twin bed, use a 17 3/4-inch diameter circle, 1 inch thick. For a larger bed, use a 23 3/4-inch diameter circle, 1 inch thick. Have the circle cut in half, leaving you with a half circle. Most home improvement stores will do this for you, or you can do it yourself if you are handy with a saw.
Paint both sides of the half circle in a color that coordinates with your fabric. An acrylic paint works well.
Staple your fabric to the back or straight edge of the half circle first. Gather and pleat as you staple so the fabric will hang in folds. Then staple the side panels to the sides of the half circle. Staple a short valance to the front area.
With a glue gun, add trim, embellishments or beads to cover the staples on the front and sides of the crown. The back area doesn’t need trim because it will be against the wall.
With a drill, attach the bed crown to the wall above the head of the bed at ceiling height using L-brackets and screws.