Modern Mechanix has posted a scan of a great full-page ad from 1936 where you can make your own toy castings and then turn around and sell them. "You can MAKE MONEY with these popular toys," the ad promises.
I see in the trackbacks that Boing Boing was there. Cory had this insight: Try to imagine a company today with that business model: "Make your own Disney figurines and sell them for real money!" Indeed.