To my knowledge there are no glove specifically made for the dry diving industry, they are co-opted from products for other industries such as chemical handling. The reason the predominant color of dry gloves are blue is because that is the predominant color used by manufacturers of gloves for the industries the gloves were designed for...why they chose blue? Perhaps the common Showa/Atlas gloves were blue was a branding decision, who knows. One can find blue, orange, green, black, and I am sure a host of other colors if one searches enough (or pays enough for a custom color run).
-Z