Oil Drip Pan Chalkboards! Spray prime the drip pans with gray primer, and then use latex chalkboard paint. Tape a border around the edge of the drip pan so it will create a 'frame' of sorts. Hang the boards/pans using 3M Command Strips (4 medium sized ones did the trick).
Alphabet magnets and number magnets But, they don't have to be magnetic, and although it wouldn't be child created, isn't there a wood burning pen you can get from Lee Valley that would mark these wood cookies?