It's so easy to do, and would make a great weekend home improvement project!
3 little steps:
1. Take a racquet to a glass shop for a custom-cut beveled-edge mirror that fits inside the rim.
2. Squeeze Liquid Nails Mirror Adhesive (lowes.com) onto the back of the mirror and firmly press it onto the strings. (Be sure to follow the package instructions carefully & protect your work surface with newspaper!)
3. Let the adhesive dry overnight before hanging with a nail.
Voila!
LTLY,
Roni♥