If you are thinking of moving to a new home or changing windows in near future. Checkout this infographic which provide in-depth information of wood blinds for your home. https://royalwindowtreatments.center/different-kinds-wood-blinds-home-2/
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.