Hi,
I'm new to the quilting board, but I have found a scrap system that works for me. First, though, I asked all my quilting buddies to donate all their throw-away scraps to me because I make beds for shelter dogs. These make great stuffing! Some things they toss, however, are still usable for "string" blocks. So, I bought 2 LARGE plastic storage boxes & started with all my scraps in one. When I use scrap, I toss the rest of it into the 2nd box. That way I won't use the same fabric twice, which is cool in a string quilt! If I ever get to the bottom of the 1st box, I'll just reverse & keep on quilting!