I cut my scraps into the largest size I can use...such as, a 6" piece would be 6" square or rectangle/ strip. A 10" square stays a 10" square. Smaller pieces or odd shaped pieces are cut into the largest size I can get. I cut squares, rectangles and strips. I do not cut odd shales ( triangles etc) until I need them then I cut them out of what ever square is the right size to get them. It does matter what kind of quilts you make. If I made lots of trip around the world Tyler quilts I might cut everything into 3" or 2 1/2" squares. Or if I made many bars rail fence quilts I would cut everything into bricks or strips. I cut my scraps into sizes I know I will use, or be able to cut needed shapes out of.