Hi Catseye, I'm in Scotland so this may not be any real help to you. 1:yes, you can buy glass paint to create a frosted effect on your glass but in my experience it usually looked streaky if you needed to cover a large area (where the brush strokes overlap it will look more dense). 2: you can buy etching fluid which is applied, left on for a certain amount of time then washed off. I believe this is a strong chemical which eats into the outside of the glass to create the frosting, but in all my years of glass painting I never used it so I can't comment on it's effectiveness. This would probably be the best thing to use to frost a whole glass, & if you apply a cut out shape first that area would be left clear so you could create your own unique design on the glass. 3: if you have a friendly local sand blaster nearby perhaps they'd frost your glasses that way. I'd google a search for etching fluid & see what turns up. HTH good luck in your search. Sally.