As mentioned in a previous post, the ceiling is one option. I’ve used a thick test clear fishline to hang pictures from the ceiling and this works wonderfully because you can’t see it. Or I’ve seen in magazines what looks like a beautiful piece of ribbon attached to either side of the top of the picture, which goes up to ceiling (like a triangle) with a nice bow at the top (grosgrain or moiré ribbon is usually used, not the shinny kind) I’m sure that under the ribbon must be a heavy duty nylon twine or something. They also make brass picture hangers that you can use to hang pictures over mirrors or down from the ceiling with: They basically look like the ribbon idea, except they are made of brass, or a nice looking metal. You may have to install a wooden molding around the top of your room to use these techniques If your ceiling is made of the wrong material.