Ultramarine blue is a deep and vivid shade of blue that has captivated artists for centuries. However, there are many other synonyms for this color that can help bring variety and nuance to your artistic creations. Some common examples include cobalt blue, navy blue, indigo, sapphire blue, and turquoise. Each of these shades has its own unique qualities, from the rich and bright tone of cobalt blue to the cool and calming energy of turquoise. By experimenting with different shades and tones of blue, you can create a wide range of moods and emotions in your artwork.