I noticed purple cripples were awesome in our Uintas and in Montana. And i had some luck with black\purple Gartside softhackle at Henry's and Strawberry this year. The Purple Showgirl is a great fly also. In the Fall 2010 issue of Flyfishing &Tying Journal is a bunch of purple flies and an article by Walter Wiese. They work! Try a favorite pattern in purple some time.