Turn a Blah Hollow-Core Door Into Today's Cover Story. Go for it! Add instant curb appeal with a great coat of orange, blue, red, yellow, green, purple or black on the door. To-do list: Freshen up the house with crisp black doors, inside and out. Remake a door with new paint, molding, wallpaper, hardware and more. Quaint or contemporary, a red door can be a key ingredient in creating a warm, welcoming entry to your home. Stomping your feet at big-box-store mats? Paint a plain doormat for your entry to exactly match your style.