I think I'd do mine on a painted board but I love this idea! Make a stenciled barn-wood valance! Turn a sign made from old barn wood and stenciled with happy song lyrics into a nontraditional window treatment.
Each window has a double rod that carries a sheer and a heavyweight cotton panel, plus a bamboo roller shade on each side. The casualness comes in with the types of materials we chose—the simple bamboo and the woven white cotton.
maybe something with Wood vs metal. but the look and idea are sharp. Contemporary window treatments by Antonio Citterio, Patricia Viel & Partners [internal shutter : sheer fabric set into hinged metal frames]