I have a system that works for me, but most of my quilting buddies would say it was crazy. Usually I get scraps and crumbs from my buddies- I am a scrap quilter for sure. I trim the gifties into usable sizes and sometimes strips for string blocks. 1-1/2" squares to 5" ones and use the rest of the usable trimmings for crumbs. Anything that you can't get seams in to make a crumb block goes into the current animal bed pillow. I am working on a postage stamp quilt with the 1 -1/2" blocks, and have almost 1000 5" crumb blocks in a container, I like variety with them so when I want to do stress free quilting I play with them! (you see what I like best?) I have enough stash to keep me happy for the rest of my quilting years.