There's nothing like a little silver in a display, whether it's real or something fake - ahem - I mean 'faux'.
Mercury glass, the real kind, is usually only found in expensive antique shops, but it's easy to make your own with some thrift store glass dishes and vases, and a can of Mirror Effect spray paint.
There are several brands, I used Rustoleum, but lots of people swear by Tremco or Krylon Looking Glass spray other similar - make sure to get mirror finish spray paint, not chrome.
There are lots of tutorials online, but the gist is that you want to spray the glass item with a mixture of vinegar and water (some just use water) and then spray with the mirror spray paint.
Ideally, the finished project will look old and like an old mirror, complete with thinner spots, dark age blotches and streaks. Throw perfection out the window for this one.
I tried this technique on a flat glass serving platter, two or three small dessert dishes and a large glass jar which could have originated in Pier 1 Imports or a similar source.
Now to try it on some glass Christmas balls and baubles.