In terms of local vernacular building styles of Pennsylvania, colonial stuff was often log cabins or rough unshaped fieldstone, materials you generated in the course of clearing land for farming. As settlement expanded along river valleys you saw a lot of proto-Federal brick stuff. In rural areas you saw a lot of German influence in the wood architecture (and people!), when paint got affordable you saw painted “hex signs” on barns, which I think should be understood as part of a Germanic tradition of mystical radial imagery (the Nazi use of the swastika should be seen the same way). Also Pittsburgh is known for free-standing toilets in their unfinished basements.