I've noticed the "in" thing now is to put crystals on the fronts and sometimes on the backs of quilts. Not that I do it, but I've seen the artists of many of the winning show quilts are doing this. I assume they're the iron-on crystals? Although I think they've beautiful, how well would these crystals hold up to actual quilt use as in on a bed or couch etc? I'm thinking not very well. Anyone use them and what do you think about the trend in general?