Some years ago, I admired a friend's jewelled mirror frame, and she gave me instructions on how to do it. It took me a long time to source the materials, but finally, I had all of them in hand: an IKEA plain wooden framed mirror, a bag of acrylic gemstones and a hot glue gun. This mini one was from Hobbycraft.
I planned first on a sheet of paper, then glued the various jewels to the mirror frame:
How bright and cheerful my mirror is. I don't really intend it for the bathroom, though. I think it would not be good for it to experience condensation, the jewels might fall off.