My sister is looking for something like this... Not necessarily the color/pattern, just something shaped that way. We have tried searching but are having no luck. Attachment Deleted
They're pelmets or cornice boards. They'd have to be DIYed or hired out, they aren't something you can find in a store since they are not adjustable at all.
Super simple to do. Joann sells a kit, but you can easily do them with styrofoam or partical board, batting/foam and your choice of fabric.
One advantage to styrofoam is that you add the fabric using push pins which means it can be removed to swap out easily or to clean. If she does a pattern, she needs to make each cornice identical or they will look homemade, and not in a good way. She can do this by laying the first she cuts on the fabric in a match and cutting.