I don't know of any quantitative studies of species frequency in shell arts & crafts, but I'm reasonably sure that turritellids would rank high. I don't know why this is so except that if you want to make long things they are an obvious choice, and of course their inherent aesthetic appeal. My collection has been assembled over the past 20 years or so, mostly from shell shows (the Sanibel-Captiva show in particular), but also from random gift shops as well as through gifts from students and others who learn of my interest. A few have been custom made for me as gifts, including the necktie and the plexiglass obelisk.