Or you could cover the pan with scrapbook paper first as the magnets would still work through the thin paper.
Here is the frig next to the pantry door.
Some of the pictures are in magnetic clear frames and some are just held in place by decorative magnets.
Or, yet another idea, paint the tin with blackboard paint and use for a message board.
There is so much you could do to embellish old tins or cookie sheets with ribbons, paint, etc. Happy crafting and I would love to see what you do with your creations, please send me pics and I will post them.
My crafty heart to yours...