These mirrors are mounted on small drapery rods. If you zoom into the picture you will see them. Another idea is to hang the from wires, much like the way pictures were hung at the turn of the century.

http://www.scottscreativehome.com/

Well, the picture pretty much shows how to do it. They have 2 rods mounted to the space between the windows. The mirrors are hung on those. Print out the picture and take it to your hardware store. I'm sure they can get you the proper parts. If not go to the local plumbing supply and they will most likely have what you need.

Do you have any idea what hardware would be used to attach the mirror to the rods? The folks at my hardware store can't get beyong the idea of hanging a mirror over a window, much less help me figure out how to do it :)

Sometimes you have to look in another direction. I think if you could find something like a little pipe hanger - two screw holes with a bump in the middle, then thread the wire or curtain rod thru before attaching to window positions. Two each for each miror so the mirror will hang evenly and securely. You don't want just a picture hanger if you ever plan to touch them for cleaning.

I saw a very cool way of doing this by using ropes - they had to be inserted into the mirrors but it was a very fun look. It was in a magazine so I cannot show you a picture.