When it comes to the geometry of interior design, rectangles are king. Perhaps that is why I love the look of round mirrors so much. Circular mirrors provide a striking contrast against the sharp angles of a desk, table or fireplace.
What's not to love about the circle? After all, it's the first shape we recognize as newborns. There is a natural and organic feel to round mirrors. But at the same time, the round mirror is a bold visual stamp on the wall, less like a window and more like an eye. A rectangular mirror fits into a room: A circular mirror punctuates it.
FIRST ROW
1. Lonny via DC Design Coop.
2. Desire to Inspire.
3. Johnelle & Brian's Rejuvenated Treasures Home.
4. Everything Fab.
5. High Street Market.
SECOND ROW
6. Moss Eclectic.
7. Greige.
8. Mihn & Ted's Lovingly Renovated Home.
9. Mix and Chic.
10. Domino via Alicia B. Designs.
Images: As credited above.
Apartment Therapy's Sofa Shopping Guide
Nikki’s Sweet and Cheery Print Studio
Good Food to Share 
The Big Book of Small, Cool Spaces 
Apartment Therapy Presents 
The Eight-Step Home Cure 
Sprout Side Table
5 Things Paris Taught Me About Travel
Recipe: Ham, Cheddar & Chive Egg Bakes
Gorgeous! & agreed!
I've been really drawn to these lately too. Also really loving the boot collection in #7.
anyone have any recommendations on where to find a large (inexpensive) one?
"A rectangular mirror fits into a room: A circular mirror punctuates it."
What an elegant way of phrasing! I agree!
I adore circle mirrors. I inherited one from my grandparents that was from a barbershop (1940s we think) that is HUGE - about 4.5 feet circumference - and hangs in my craft room (makes the tiny room look much bigger, but I really haven't got a good place to properly hang it elsewhere). It is a simple round with a bevel and weighs about 30 pounds.
I spent forever tracking down a small round mirror with a subtle gold frame for my dining/living room... about 10 years ago, it was next to impossible to find a round mirror that wasn't huge and gaudy in regular stores.
As far as finding a really large one inexpensively - I'd suggest checking craigslist and junk/antique stores and also look into the discount home stores - Home Goods, Ross, maybe even Kirklands and Pier 1 and maybe you'll find something not too terribly expensive. Oh! And don't forget the old standard department stores: JCPenney and Sears both have some nice and non-tacky round mirrors in amongst the other styles...
We have a great one from Ikea in our family room. Only $99. Sadly, I believe it's discontinued.
You can see it here:
http://thenestinggame.com/2011/08/26/nest-tour-family-room/
agreed, @illuminatedpst, it's so well put, as is "less like a window and more like an eye"
Also, with a round mirror you can do this DIY to it:
http://papernstitchblog.com/2010/02/02/how-to-make-a-frosted-glass-doily-mirror/
I did it to my round mirror a couple of weeks ago, and it turned out great!
Round mirrors are SO fun. (and often overlooked) In my experience, large ones aren't cheap, but www.UniqueMirrorsOnline.com will work with you on the price if you find one you love and they have a pretty vast selection too.