Wow, If it were me, I'd throw a pewter in there for some easter egg variation when you breed it.

Pewter/fire-possibly get pastel fire/cinnamon fire

pewter/bumblebee-possibly get cinnamon super pastel, cinnabee, killer bee

I have no idea what a pewter will do to a pinstripe but it might be worth checking out.

I'm probably missing some combos but you get the idea.