What Color Would You Paint This Home's Exterior Doors? -- Good Questions

Q: I'm struggling with what color to go with for the front and back exterior doors on my new house. The house is mainly red brick, with dark brown trim. At some point I'm hoping to switch the trim to dark grey, black or white, and if possible I'd prefer to choose a door color that will coordinate with both the current trim and whatever color I go with in the future.