Purple clouds, These types of clouds are some of the rarest types of colors for clouds of all the possible ones, but in my opinion, the prettiest color. These clouds are made only in the perfect senario of time of day and amount of clouds and sun location. But if you can see these, you are lucky. These are only available at sunsets and sunrises, more common at sunrises though. The reds of the sunset mix with the blues of the sky and this creates a purplish hue.