I would never use dryer sheets in a quilt because of the stench. Please consider that there are many people who are chemically sensitive, who may not know that the quilt that they received is the cause of their problems. To those who say that there are non-scented dryer sheets, I've heard of too many problems with the dryer sheets causing problems by clogging the filters in dryers and resulting in fires, so I wouldn't use those in a dryer either, and therefore wouldn't have them even available to use in a quilt. If you use these in your dryer, please be extra vigilant checking your filter for clogs, and the path inside your dryer and dryer vent to the outside, for clogs and buildup of oily lint.
I use fabric (muslin or worn-out sheets) for string quilts. I like the suggesting to use old telephone book pages.