What is the distance between the sconces? and measurement of your vanity.

Probably the easiest way for you to find a mirror is to measure the distance between the sconces and the lights to the tile. and then look for a mirror framed in silver, brushed nickel that fits in that space. I'm thinking a square or rectangle placed long side horizontally between sconces.

Keep at least 4 inches away from the edge of the shades.

Good idea.

Your local picture framer can make a mirror for your bath in the size you want. Measure, allowing 3" in each direction for clearance. I would select a square edged stainless steel frame. Be sure that the framer understands that the size you give her/him is the finished size.

The distance between the sconces is 52" and the vanity is 73" long. Thanks all for the suggestions so far!

Definately leave at least a 4" to 5" clearance between light fixtures not only for;aesthetic purposes, but for safety as well. I love the plum color choice, and I would stick to silver ot brushed nickel for the mirror selection. The current fixtures will compliment it the most, and it would be easier to clean. A rectangular mirror will work well, but in addition; add an extra curved or angled decor piece above the mirror. This will mimic the lines, and curves of your selected fixtures. Good luck, and how fun! Did I say I love plum :)

Can't see the rest of the room -- but, try this. The frame has both a silver-grey tone and brown. If it's your style, it could work.

as stated, leave space, preferably 5-6 inches to the sconce. I Like a thick frame like this pictured above but the style on frame would depend what else you have going on. Carolyn has the right idea.. you don't need to settle for stock size if it is "off", rather, get one made to size. Won't cost much more. I like the idea of tying in a touch of the brown with the silver/grays. Best of luck!

I would select a very simple square edged framed in stainless steel or in a wood finish.