I agree with everyone else that those are fondant or gumpaste circles folded in half and then in half again and then opened up. As far as the silver dragees, I think if it was me I would make a gumpaste or fondant "ribbon" and attatch the silver dragees to that with royal icing, melted chocolate or piping gel, and then put the ribbon on your cake. That way you can remove the ribbon before eating the cake and not have to eat all of those dragees. If you stick them to your buttercream, you either have to fish them out of the buttercream one at a time, or eat them, which I'm not a fan of.
That is such a good idea! I think cakes with the candy pearls are beautiful but always wonder how it would be eaten!