if you don't mind the scent or you can use unscented, they work fine.
I also keep a few around for making applique circles. I draw my circle on the back of my fabric, lay it face down on a dryer sheet and stich all around on the line. I cut a slit in the dryer sheet and turn the circle right side out. Gently work the edge out (sheets are fragile) press and you can cut away the center of the dryer sheet or not, and machine sew the circle to the background.