A while back I found a unmarked Rusty Beer mug, I scrubbed it down with some vinegar, and have been re-seasoning it in the oven. I think once I get a few more coats, I'll try keeping it in the freezer. and after I cook a meal in a skillet I'll be able to wash it down with a nice ice cold beverage. I bet it will work pretty good at keeping things cold, since cast iron works well at keeping things warm.
