As seen in CTC&G Nautilus Architects featured for Riverbend:

The white-painted siding is referred to as Novelty siding and can be spotted on older structures, often accessory buildings or camps.  We had slightly wider-than-normal boards milled to work with the particular scale of our building.  The white and green is such a classic color combination for the look we are creating.
Under the windows, the tiny river stones, “river jacks” as they are called, are growing in number to create a beautiful, multi-colored field.  Capping them are thick, granite sills that, when applied, instantly create the impression that this building has been around for ages.

nautilus Interiors