A question about the origin of Feruchemy got me thinking: If larasium gives you Mistborn powers and is a piece of Preservation and atium is a piece of Ruin, would an alloy of these metals give you Feruchemical powers? It makes sense, considering Feruchemy is an end-neutral art.
Anyway, that's my whole theory.
P.S. I just joined these forums, so correct me if this topic is in the right place.