Jerome - that photo is of the "Mardi Gras" sail pattern.
Chris - do you have any documentation (like a brochure) that the purple mylar (#126 in the pattern chart) was named "Purple Rain"?
Jack - that's the only one of it's kind I've seen - It looks a lot like one of the 17 patterns.
BTW, I'm working on a poster of the sail patterns for Hobie Cat & I'd like to get all of this stuff nailed down.