usually I'd say just as you take a dark grey instead of black, use some light greyish color. maybe like with a hint of color. that's up to you. many people like shading white with a purple-ish grey or other colors. hope you get what i mean
I'm not an expert though, and as soon as i take a grey-ish thing instead of white so i can highlight it my commissioners say it looks dirty. so i don't....