Like the surface of the moon - at least as seen from Earth - these glass circles look.
On thin colorless glass I melted a mixture of fine, medium and coarse crumbs at a relatively low fusing temperature. The low temperature preserves the structure of the individual granules very nicely. The highly textured surface refracts the light in a particularly interesting way. If you can use a fusing furnace, you should try this way of " own glass production ". The possibilities are, as in glass design almost always, " limitless ".