I may well have got more than I bargained for with such a general question. Its interesting to think about the small countries which could still have fascinating companies available for creation. does anyone know what was going on with the Swiss military at the time, beyond the Swiss Guard.
Thanks
Blofeld
Swiss guard is not switzerland! they are in vatican city.
virtually every Swiss canton has its own army and different uniforms, though a mix of second empire french and prussian styles are dominant! So, go for FPW miniatures.
Unfortunately if you google "Swiss army" you get the well known knife. Try to start something like "Sonderbund" and you get some ideas.
But I think switzerland offers some interesting aspects, since Companies can fight each other in some fictitious settings of a Civil war or Inter-Swiss war.
The same could also apply to the Italian Companies of the era, with one "Garibaldi" company in Red, with piedmontese allies in blues against naples or papal states. in blues and white uniforms. See mirliton miniatures for suitable figures.
Back in vatican / papal company: I amgine one with monks and nuns as heroes and medics plus Swiss guards and pontifical zouaves for the military types!