Right now there's a lack of end game "spooky" themed content. It's at least the case that Manyullyn and Aurinium are purplish/pink, but I think I would like to create additional materials that involve pouring Aurinium/Manyullyn on bones or perhaps even ghast tears.

That would give us a purple/pink bone as an end game material. I think a few more blood, bone, and tears based mechanics might be warranted just in general, even if they are just slight reduxes of existing materials.