For a more edgy look try a brighter yellow with a dark gray roof.
Grey on underside of roof.
An onyx black roof has the same undertones as a dark gray roof.
They are both really classic and look sharp but my preference is the gray because its a little less heavy.
The white or light gray stains on the stone wall at above right can also appear on stone or slate or other roof materials.
In the vast majority of cases the mold growth is caused by condensation.
See debris staining roof debris and see proximate cause roof shingle stains types of roof stain by color location probable cause and.
Black brown or gray stains on roofing products due to debris left on the roof surface such as piles of leaves and organic waste from nearby trees.
This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
Lichens is not a stain in the proper sense of the word but on asphalt wood or some other surfaces it can damage the roof and reduce its future life.
For a more traditional look a sunny light yellow pairs beautifully with a light gray roof.
So the metal gray is dominant.
The yellow is more pronounced on a sunny day.
Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.
I need to take another set of pics to sure the color more accurately.