It's kind of a waste on the wall, because silk rugs feel so luxurious and rich, you want to run your hand over it all day. I've seen people use it as a desk top, but then you might end up with two arm sweat stains and maybe some coffee stain rings.
I wish I was rich enough where it didn't matter to me that I put a $1000 silk rug on the floor to wipe my dirty shoes with.