One of the most reliable concepts in color coordination lies in the effective use of contrast. You’ll encounter this option a lot during your initial discussion with your roofing and siding contractors about what colors you want your exterior to show. The most basic rule in contrasting colors is that you want trims and finishes to stand out differently from the rest of your home. When it comes to your roofing system, this role is usually filled by your soffit and fascia boards.