Craftsman style architecture and interiors are very geometrical. There usually is a repetition of shapes such as squares/rectangles, strong horizontals in molding (exterior and interior) and symmetry throughout.

Craftsman style also uses a lot of natural wood applications. Trim, moldings, custom wood detailing. (Think of a craftsman - and this is the aesthetic characteristics).

Here is an example of a natural interior home, and one that painted most of their interiors white, both Craftsman style idea books.

http://www.houzz.com/ideabooks/105671/list/Craftsman-Style-interiors

http://www.houzz.com/ideabooks/175512/list/Craftsman-Style

Thanks! I am such a Greene & Greene fan.

an architect is your best investment!