In love with the black white and red color schemes :) Red is probably the most versatile and widely used color for entryways because it looks amazing with just about any color and style of exterior. Red door on a white house with black trim?
Unusually shaped vivid purple (I am not a fan of purple) door. I would paint it that traditional blue color or red that Greece is known for. But any pop of color really is super fun against all that white!