Gray-blue is a beautiful color that consists of equal parts of gray and blue. However, there are various other synonyms that can be used to describe this shade. For instance, it can be called slate blue, which is a deeper and more muted version of the color. Another possibility is steel blue, which has a higher proportion of gray and appears cooler. Ice blue is also a similar replacement, but has a slightly cooler undertone. If you prefer a warmer tint, consider using the phrase "dusty blue." Alternatively, cornflower blue, periwinkle, and powder blue can also fall under the category of gray-blue. Each of these synonyms can add a unique touch to your design or artwork.