"soft colors" is correct and usable in written English.
You can use it to describe colors that are gentle and muted. For example, "The walls in the nursery are painted in soft colors that soothe and relax."
And the theme was pure: lovely soft colors, embroidered flowers and colored tights blending into stilettos on stemlike legs.
Bonnard was soft and grew softer: soft colors, soft contours.
This year, they're seen in melting, soft colors.
The soft colors, and especially a dawn pink, looked like the inside of a shell.
Florence Klotz's diaphanous dresses, in soft colors, beautifully emphasize the curves of the women's torsos.
But there's an inviting covered plaza outside, with lots of windows and soft colors everywhere.
"What I'm selling are soft colors, flowing designs with a patina of age and texture".
He showed me some original storyboards, which featured nature scenes and soft colors.
An open kitchen, soft colors and well-spaced tables keep the Mediterranean Grill a favorite.
The 144 tasteful, cozy rooms with soft colors include coffeemaker, hair dryer and data port.
Soft colors in superlight fabric meant that the designs folded flesh with cloth in the most delicate way.
