I think these demilune (or half) shades are a wonderful decorative option for wall sconces and lamps. Its a nice idea especially for sconces that don't protrude far from the wall , which usually have glass or metal shades. I think they look fabulous on the two antique sconces below (the first one is in a Fortuny fabric), and add a touch of authenticity to them.
This is my favorite image. I quite like the juxtaposition of the modern shelving and accessories, the oak panelled walls and those neo-classical lamps with half shades. Very chic!