Hi Gene, a little curtain might look cute and nice.
How about tension rods and curtains?
Hello Gene: One thing you could do is to use baskets on the shelves. Or, you can use Wire Mesh or Screens. Shutters. Fabric. Chalkboards. Mirrors. Here is a site that will give you more information:
Hi, you could also paint the inside of the shelves, cover with fabric or wallpaper. :)