I continue to play around with metal ATCs from time to time. One reason it is so easy is because I have some pre-cut ATC cards. Some time back, I got in the habit of cutting up cardboard from Kleenex tissue boxes. That was back when I was making ATCs featuring fortunes from fortune cookies. (A project that died before it really went anywhere.) The cardboard is study, but not too thick. But having them at the ready really prompts me to pick one up and start a new card.