Dont want to use chalkboard paint for the whole door? Michaels sells rolls of chalkboard stick-on paper, perfect for pantry door! Stick on the inside for "Grocery list" when kids eat last of something.
An old picture frame and a few small cup hooks can be turned into a great place to keep your keys organized. Just remove the glass from the frame and insert the hooks to hang your keys. – 150 Dollar Store Organizing Ideas and Projects for the Entire Home
If you could not make from tin or flashing-- use posterboard and then paint and patina with sophisticated finishes--iron , pewter or steel metal finishes which can't tell from real thing. these tin houses are amazing