We recently acquired this really cool engraving tool from a local store. It can etch multiple materials, but one of the coolest things that is does, is etching glass.
It’s definitely a time consuming task, but with some patience you can make some pretty cool stuff. We decided to etch a cylindrical vase and turn it into a candle projector. When a candle is placed in the vase and the room is dark, it projects onto the walls whatever design has been etched. It works really well and opens the door to many other project ideas.
Get the tool here if you’re interested – Etching Glass Tool