Attach a circular mirror in the center of the square frame.
Pound several nails into the frame's outside corners.
Using a broom-stick, wrap 10-guage wire to make wire loops that you attach to the corner nails so the wire encircles the frame.
Make small "bouquets" with glass or plastic ornaments with wired stems. Attach the clusters to the wire until it covers the wooden mirror frame, leaving the mirror showing.
Add crystals or prisms with florist's wire for sparkle.