I like the idea of getting maybe ventures from chests. Those are always handy. But please no potions. There is only one potion I need that is good to pop in some fights here and there, but that it. I get them from the market board.
I guess crafting materials would be alright, glamour prisms. Things like that. Something that you can sell or use. Definitely make them a rare find though. I think there should still be more systems out there to encourage crafting.