There are a number of synonyms for the color silvery-blue, including sky blue, powder blue, steel blue, periwinkle, slate blue, and lavender blue. Each of these shades of blue has a distinctive quality - sky blue evokes the color of a cloudless summer day, while slate blue is more muted and restrained. Powder blue has a delicate, pale quality, while periwinkle is a softer, more feminine shade. Steel blue is a deeper, richer hue, while lavender blue has a hint of purple that makes it uniquely beautiful. Regardless of which synonym one chooses, the color is always cool and soothing, evoking the tranquility of a clear sky or calm sea.