So I grabbed my box of polish to look for something suitably steampunk. I ended up going with Essie's "Pretty Penny" (yes, again) for the stamp color and the basecoat is ORLY "Buried Alive".
This is after a day. It's chipped and wasn't great to begin with. I'm still learning ;)
If I had to do this over again, I'd probably throw some silver and blue metallic in there too.