I did that in my guest room - no problem at all. The carpet is pretty low pile and the rug is a fairly thick sculpted type oriental. I have no pad under the rug. I also have a very short, dense wool oriental rug on the carpet in my living room. That also works fine. I have all these rugs on carpet because I moved from a house with wood floors to one with more carpet. I hope to get rid of the carpet someday when I feel like moving everything again. So then I will need the rugs and in the meantime I can't stand the plain beige carpet. In another room I have a thick wool runner that covers the width of carpet from the deck door to the wood floor in the dining area. It has no furniture on it that holds it in place so it ripples a bit. I need to find a way to keep it flat.

Thanks @loobab! That bedding has turned out to be perfect in every way. It has become the inspiration for the whole house color palette. As often happens with decorating projects, I now have a new problem to solve. I have no place to put all those decorative pillows at night. There’s no other furniture in the room besides the bed and nightstands. Adding a bench at the foot of the bed seems silly with all that space on the sides to work with. A chair would be nice, but what else to put with it? I don’t need or want a dresser. And we don’t watch tv in that room, so a media console isn’t relevant. I fear just plopping a chair in one corner won’t be enough. Please help!

The rug you have chosen will compete with the bedding. I would suggest a solid in a blue or gray is you prefer. With that said, it appears to be a small room so the majority of the rug is hidden by the bed. I would opt for two smaller rugs on either side of the bed.

I would recommend an Aubusson rug such as this one.