I am looking to make my own art glass tiles recycling stained glass, wine bottles, etc.(into ovoids, circles, tray shapes, etc) there are three ways I can think to do this, what is the best (safest, most efficient, cost effective) option? 1. Bonfire with bellows (will it reach 2500F)? 2. Fresnel lens (can I melt enough glass to make a 10"x6" tile)? 3. Microwave (again, can I melt a large enough piece to be worth it, and will it blow up!)?