I am thinking you just want that frosted look ? You can buy glass etch to do that. It's a paste you apply that literally etches the glass. Corrosive, you bet. It's acid, but you wear gloves and put down papers. No chance of breaking the glass or going too far with the blasting.
I think you rinse it off with water, but it will say on the jar. Craft stores should have it. Be much easier to control where it goes, I'd think, than sand blasting.
Or, just get the vinyl adhesive sheet that looks frosted. Only brand I can think of is MacTack, but places like WalMart ought to have it. Stick that on the back. Same look, quite inexpensive, and you can remove it if you ever get unhappy with it.