This is so easy! All you need to make your own valence curtains are styrafoam board from your local home store, a glue gun, some fabric and fringe or ribbon (or some other decorative item) for the bottom. The cost is next to nothing to make and it looks really nice. To install them, just put some large nails in your wall and stick the styrafoam board through the nails and your valence curtains are in place!
We would like to give credit to the person responsible for this video about valence curtains, but all we know is that her first name is Christine. So, thank you, Christine for posting this great idea on YouTube and sharing it with the rest of us.