Framing bathroom mirrors - a great tutorial with step-by-step instructions & pictures. glue the molding right on to the mirror. I did this in my bathroom, not hard and a very inexpensive way to update a plain mirror.
DIY Framed Mirror Tutorial~ Thick baseboard, and some corner round molding. cut a frame, after measuring the mirror. using 45 degree anglesattached the corner round to the edges of the frame with some wood gluecouple coats of semi-gloss white paint.
GREAT idea for the hideous mirror in guest bathroom! add moulding trim with tile border around large bathroom mirror. Rather than removing large bathroom mirror, add moulding trim for a more refined look.