I knew I had seen that boat before! (#393)
Jamie and I both bought boats from the '89 Nationals in Chicago (the last year of provided boats until last year)
Jamie had the blue color scheme (#115 in the color chart); I had the teal (#117). My boat turned out to be really heavy (345#), so I sold it in '92.
Jamie later bought one of the mylar sails for his boat. I'll have to add the color pattern to the "unnamed mylar" section.
Chris - can you e-mail or post a photo of the "Purple Rain" pattern? The only example that I have is a partially obscured sail in a beach photo from the '92 Nationals in Bear Lake, UT - and it's really small.