What about using the shutters to cover a stack of toilet paper? Or to hide the toilet bowl brush? I have a very small bathroom so many things cannot be tucked out of the way. This looks like a nice solution for hiding stuff!
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.