The above picture was taken by scientists in Antarctica, who are starting to see hints of the sun for the first time in months as the Antarctic winter begins to wind down. The story from CNN can be found here.
These clouds are known as "nacreous" clouds, and also are known as "mother of pearl" clouds. These clouds form in the stratosphere (higher than almost all other clouds) and have shapes dominated by wave-like motions in the stratosphere.
For those interested, "nacreous" means something possesing the qualities of mother-of-pearl, or iridescent.