Texture on Glass: Large Wood Rasp

I've been playing with texturing the glass - using various items that were, by and large - not actually designed to be used with molten glass. For starters - this giant wood rasp - available at your local hardware for not very much at all - is nice because it gives you 2 textures and a flat and a curved surface to play with.

The easiest was to use it is to put the glass down, say on your torch marver, and mash it with this. Do it fast - the rasp heats up and sticks to the glass surprisingly quickly - especially given the volume of the metal.  Just press and release.

The larger of the textures gives you this.