I bought some white valances from Target, ribbon and double-sided fabric/ribbon tape from JoAnn's, and thought - "Let's give it the good ole college try".
It seriously took about 45 minutes to do all three. I used a level and pencil to mark several places 3 inches from the bottom of each valance. I then cut the ribbon the same length of the valance. Next, I laid out the riboon tape in two spots on the ribbon, un-taped the other side and carefully laid it down on the material...and wha-la a curtain is done.