Many houses are built with a standard flat mirror the width of the sink with lighting above it.  There are so many beautiful framed mirrors available now but it's a lot of work to take a fitted mirror out, re-paint or tile and then hang a new framed mirror.  Well, there is a quick solution!  Keep your eye out for a nice chunky frame.  I've seen a few that come without a backing which works perfectly for this, but if you see a big chunky picture frame, you can take the glass and backing out and hang it over your mirror.  Just have your measurements on hand and make sure that the frame will cover the edging.