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Example palette: A black door and white or light-colored trim look fantastic against a soft sage background. Here are some great sage greens to try: Comfort Gray SW6205 (siding A) from Sherwin-Williams, Aganthus Green 472 (siding B) from Benjamin Moore, and Steel City D63-3 (siding C) from Olympic Paint.
It doesn't get more classic than this. A screen at the home's front entry telegraphs an instant sense of coziness and welcome. Painting it black helps to set it off and create a focal point — notice how your eye travels straight to it. Yet the color is neutral enough not to stop the gaze.