I don't cut strings. If I cut a strip off of yardage I call that piece a strip, not a string. My strings come from trimming quilt backs or from the very end of a piece of fabric that is less than 1.5 inches. Or it may be the leftover end of a strip. I consider selvages a type of string.
Here's some quilts I have made from strings. I have not included quilts made from strips. In other words I don't usually cut anything from yardage to make the string part of these quilts. I just use the string scraps as they are.
String Quilts With a Consistent Center Strip or Heartstring Quilts.
Most of these were foundation pieced on muslin.
(Note: the center strip is the one piece of these quilts that is actually cut from yardage as well as borders if they were added).
Without a Consistent Center Strip
Blocks pieced by color