Knotty Issue Knot each end of fabric and secure it to a curtain rod for a valance look that's surprisingly simple. Be sure to measure enough length in the fabric for the swag, the sides, and the knot. Other valance ideas also.
Making Plain Pretty Cheryl from New House to Home elevates inexpensive burlap fabric by folding it into deep box pleats and stapling it to a board to make an easy valance. A stenciled monogram adds even more detail.