Having a magnet board is great!
Ours is a $10 Galvanized Steel Sheet
https://www.lowes.com/pd/IMPERIAL-24-in-x-3-ft-Galvanized-Steel-Sheet-Metal/3234805
I’ve seen people put frames on them too. However, you’ll want to rotate the magnets.
Here is a list of the different types of magnets:
Christmas (although they were flimsy and fell apart quickly)
*pictures of the kids and teachers (maybe resin)
*wood cookie
letters or animals (it is a good idea to coat them first with acrylic spray so they last longer)
butterflies (https://www.amazon.com/Simulated-Butterfly-Magnets-Magnetic-Stickers/dp/B00981987S got destroyed within a month but they were cheap and fun)
photos of face pieces (to construct their own face)
glass gem magnets
magnet gears (lakeshore has a set for $30)
shrunken kid drawings (using a photocopier)