It can be a really wide genre. Firefly was steampunk, but with more of a western feel to it rather than the typical victoriana of the east coast, but that's the only steampunk show I can think of.

Now is a great time to be pitching a show like that since it looks like the subculture is leaking into mainstream and settling in nicely. There's a niche that's crying out to be filled.

Good luck!