In addition to their blue color, Neptune and Uranus share the characteristic of being classified as ice giants. This categorization is based on their composition, which consists primarily of various ices such as water, ammonia, and methane, along with a rocky core. The ice giants are distinct from the gas giants like Jupiter and Saturn, which have a predominantly gaseous composition. The presence of these icy materials contributes to the unique appearance and properties of Neptune and Uranus, including their striking blue hues.