...is the occurrence of colours cause by diffraction, and is fairly uncommon. The pastel colours are produced by small water droplets (or ice crystals) of similar size, scattering light. This is not to be confused with a rainbow, which requires much larger droplets of water, and produces the effect through refraction.
The cloud that produces the phenomenon has to be optically thin, such as altocumulus, so that rays from the sun only encounter one droplet or crystal.
...there, I've said it.
300 mm f/4 AF-S Nikkor with TC-14EII converter. 1/8000 second at f/8. ISO 200.
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