This unusual meterological display was captured while looking approximately South on the afternoon of August 12, 2008 at Cold Water Lake, Michigan. Note the small splash of blue-green to the right, as counterpoint to the pink and orange on the left.
Thanks to Eddie B for this information. This phenomenon is properly called a Circumhorizontal arc, or more casually, a fire rainbow. Wikipedia has a good article on the subject, with some nice pix included. It is a high atmosphere event, indeed caused by light refraction of ice crystals in a specific orientation. Here is a magnificent example.
Update 2, midnight-ish:
Last word of the haiku changed.