I don't have a lot of speckled finishes, I think my favourite two would be from the Models Own Speckled Egg collection. The green one Magpie and the blue one Duck.
I would have said nail polishes which need more than two coats to achieve opacity. However more recently I can appreciate a speciality finish polish which needs more coats to show the glowy shimmer or flakie depth. But a cream finish polish, two coats maximum.