i think blue matches or probably yellow if you just try black it will work with any colour except black.
It's a little bland of a color combination but it would definitely work if you worked it!
Gunmetal-gray is considered a dark color. It is a shade of gray that has a slightly metallic finish, giving it a darker and cooler tone.
Charcoal is a dark gray color.
The opposite to gray is gray dark gray is light gray ;)
Dark gray.
gray converse
Gray is said to be dark and dismal as in gloomy gray skies
Charcoal is typically black in color, with variations in shades from dark gray to black depending on the type and quality of the charcoal.
gray
dark gray, brown, greenish
They vary in color from dark gray to white.
A nasty color