I depends on how much I have left of that particular fabric. Some "fancy" fabrics, I keep every tiny scrap. Others, I may toss an off-cut of 2" or even more. Generally, I keep anything that is larger than 1 1/2" strips or 2" pieces. I put the tiny pieces in gallon bags, sorted by color. Larger pieces, I put in two bins (light and dark). When the bins get full it's time to make another scrappy. The small pieces are great for applique.