I really like the idea of stone soup, but that was always a simple peasant dish, so I think dullite would be a better ingredient. Maybe each type of rock could have its own recipe so we could still have a meal that sparkles.
I would LOVE a shiny object soup! I always wanted a use for those things and it would take someone who'd tried a bunch of things to figure out where to get a shiny object for the recipe :D
+1 all different types of stone soup too!
I second the idea of dullite soup!
I really don't think the shiny object of no intrinsic value should be useful for anything. It goes against it's very nature.