For the bigger pieces, I use Bonnie Hunter's scrap user's system - once it it less than 6" wide, it gets cut down into strips - 5", 4.5", 4", 3.5, 2.5", 2' and 1.5" - short pieces get cut into squares of those sizes. Anything smaller than a fq gets folded by color in a plastic drawer, and I go there first for small projects.