Thanks! Heat isn't required for this kind of etching. It is usually required somewhere in the process for cutting bottles (like cutting the top part off of a wine bottle to make it into a glass) if you're not using fancy hardware - but I'll post a bit about cutting glass with a cheap glass cutter soon. I also have diamond drill bits that fit onto my black and decker Dremel-clone, which I can use for drilling holes in the bottom (for planters) or in the side (to run a cord through). I'll definitely try to take better pics for those though :D