I took a 12x18" copper sheet, I believe 0.025" thickness, and cut that into 1" squares. (tin snips)
I then nipped one corner off each square and rounded that edge. (file slow / handheld sanding belt fast)
I domed each square using a ball-peen hammer and a block of wood.
Hey! Another thread you got. Been watching GOT ever since my friends fed me all this hype. Really like the story, and no I'm not watching it for the "sexposition." lol