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.
Towel Window Treatment Use kitchy kitchen dish towels for fun window treatments. Simply clip drapery hooks to the top edge of a dishtowel and hang from a cafe curtain rod. The towels are easy to remove for washing and can also be changed out seasonally.