Search (old) sunglasses, glue and rhinestones

I chose to use big square rhinestones. Of course you can use other shapes, other combinations, ...
Me personally, I think very small rhinestones will be beautiful too: you can create patterns, maybe an image if you have a large surface.

Make the pattern twice on your table (to make sure you have enough stones)

glue them on your sunglasses (use strong glue, you don't want the rhinestones to fall off when you wear them!)