While I really dig the simplicity and beauty of the smooth pieces I think that texture is where you're going to find most success in planted aquariums. When you say sandblasting I'm imagining that it's after the piece is cooled but I think you could also try adding fine sand to the surface of a hot piece so that it partially fuses. Another thought is streaking or ribbed surfaces on the glass. Finally thought: nubs and / or loops so that people can tie on moss or whatever without having the string slide down the glass. Good luck and send me a sample if any of those ideas float your boat!
Easing my toes in the water