A gradient blue designer refers to a professional who specializes in creating visual designs that incorporate a gradient of blue hues. This can include graphic design, web design, fashion design, and other creative fields. Gradient blue designs often evoke a sense of calm and serenity, and can be used to convey a range of emotions and messages. Designers in this field use various software tools to create and manipulate gradients, such as Adobe Photoshop and Illustrator.