White is perfect for a Cape Cod house, as it will make a modest-size home seem larger. With its associations of purity and innocence, white also works well on a simple Cape Cod house because if there's any house style that evokes notions of a simpler time, it's this one.
White is also a great color for homes in the tropics. It repels the sun's heat and stands out against the deep blue skies, lush green landscape and azure water. Few things look cooler than white stucco walls, coupled with a soft accent color, reflected in a pool of deep blue water.
White is ideal for where you want to see a lot of texture and shadow. Whether it's the lap of each siding board or the moldings at the eaves, windows and more, shadows will be accentuated against a white background. This will go a long way in articulating a design's richness of detail.
A home with a basic and simple gable shape, almost like a child's drawing, is made clearer and stronger through the use of white. And white can be a reflection of our more rational side, so the overall design is more abstract and pure.
Keeping the exterior all white can play to the design strength when the home's form is simple and strong. White plays to the lack of any detail or texture in this case, allowing the overall form to be the dominant visual feature.
The "white box" created by the Europeans in the early 20th century and popularized in the States as part of the International style used white almost exclusively. It was clear that the design of the homes was driven by an intellectual purity and a machine aesthetic.