These photos show two wonderful examples of the more mirrors the merrier! Auctions are a great place to find a wide variety to collect and plan your wall.
I didn't need to go far to find a wide variety of mirrors on offer at an upcoming auction. Stair Galleries in Hudson, NY has an auction coming up June 23rd with quite a few mirror options. A pair is always nice to have since they can decorate and balance a space. This pair are George II walnut carved and parcel gilt, and measure 4 feet 9 inches by 27 inches. These are Lot 328, and have an auction estimate of $2,500 - $5,000. I love the mix of wood and gilt for the warmth.
Mirror collections often look even better with a mix of plain along with elaborate. I like this Italian Baroque giltwood mirror. It has a great chunky carved frame, and you could surround it with simpler (less expensive) mirrors for fabulous effect. This is Lot 65 in the Stair auction, and has an estimate of $800 - $1,200. This measures 42 3/4 inches by 31 1/2 inches.
Here is a lovely simple oval mirror. There is subtle carving to the frame, and of course the giltwood to make it stand out. This is a George III style mirror (Lot 305), and measures 4' 6" x 44". It has an auction estimate of $1,200 - $1,800.
To mix up the collection a bit, add something a bit different. I like this ivory and ebony inlaid mirror for its wonderfully shaped frame with all its angles, and then the oval mirror in the center. This measures 26" x 20 1/2", and is Lot 123A. It has an auction estimate of $300 - $600. It's not too big, and look great in a collection, or on it's own in a powder room.
I have a very modern house, and yet I love my own George III mirror with a carved giltwood frame similar to this one. It's elaborate, makes a statement, and makes the room it's in special. This one is in the Stair auction and is described as George III style. It measures 47" x 28" (Lot 346), and has an auction estimate of $700 - $900.
If I were planning a wall of mirrors, I'd start with one or two special elaborately framed ones, and then fill in with inexpensive ones. Auctions have both, and you can even supplement with a few from Target!