I think you interpreted what I said a little too literally. What's marketable is combining creativity and knowledge to make things. I'm not a craftsman or a merchant, and my magic is... questionable at best, so I'd leave it to the experts to think of what would work.

As for more information... Have you tried talking to the Elphame traders? I'd encourage everyone to reach out as much as possible, and the more people who do so, the better.