@benjojo
Sea-glass can be made.
I have a friend that Thumbling stones.
Similar process. You will need a Thumbler.
Break all your colour beer bottles , wine bottles
Put the in the Thumbler , with some silica , of course with different sizes. See Lapidary for natural stones process.
Makes perfect sense. I think I'm more in love with the search than what may be done with the material so I'll just keep hunting I guess :))