I tend to like making scrappy quilts. Whenever I am finished making a quilt, I take the smaller scraps and cut them into 2" and 2.5" squares. These go in separate boxes to use together or in upcoming projects. Some people also cut other sizes, but I find these are the ones I use the most. I also have a separate box of various sized triangles that could be made into half-square triangles. I have a bin of "strings", separated into two sections - backgrounds and other. And I have a bag of selvages - whenever I'm cutting fabrics, I cut a 1.5" strip with the part of the selvage that has the writing on it. When that bag is overflowing, I sew those together into squares or triangles.