I did strips like this for a confetti quilt. The strips were as long as the quilt was long, and any width, from 2 1/2 to 5 inches. Without a foundation, they would never have been straight strips. Of course my pieces were anything from a straight strip to a triangle and everything in between. I used fabric for the foundation. Nothing to rip off. The best fabric foundation for this is a very worn-out bed sheet. Just use the parts that are very thin but don't yet have too many holes. Other thin trash fabric works, too. But heavier fabric would add too much weight to the quilt.