Grey river rock: calm surface, depths unexplored.
Still Waters Run Deep is a cool grey, close to teal.
It can be described as cool, muted, greyish and dusty.
Set in white, because white reads best on it.
"Still waters run deep" is a proverb of Latin origin now commonly taken to mean that a placid exterior hides a passionate or subtle nature. Formerly it also carried the warning that silent people are dangerous, as in Suffolk's comment on a fellow lord in William Shakespeare's play Henry VI part 2:
Read on WikipediaStill Waters Run Deep is the ninth studio album by the American vocal group Four Tops.
Read on WikipediaDeva Salote Mahal is a soul and R&B singer. Mahal is the daughter of American blues musician Taj Mahal.
Read on WikipediaA still is an apparatus used to distill liquid mixtures by heating to selectively boil and then cooling to condense the vapor. A still uses the same concepts as a basic distillation apparatus, but on a much larger scale. Stills have been used to produce perfume and medicine, water for injection (WFI) for pharmaceutical use, generally to separate and purify different chemicals, and to produce distilled beverages containing ethanol.
Read on WikipediaProverb