I have seen them all over and I love it the round mirror..... It is a fantastic accent in any space. They work well in groupings, over the bed, over the mantle piece. Mirrors also provide an extension of any space by reflecting the objects, the colors in a space and help bring the outdoors in. Using mirrors throughout your space to create a sense of depth is a great design tool.
I have brought together some of my favorites here!
The foundry Mirror
Beveled round mirror
All of these mirrors are available on My Sparrow....
Photos from House Beautiful and My Sparrow