I know everyone has scraps and everyone has a different way to store them.
For me, I store some in Mason jars. I have them beside my cutting mat for easy use.
I put salvages, triangles cut from binding, leftover/unused binding strips, and other unused strips in corresponding Mason jars for future possible use.
I really don't have any plans for most of them, but maybe one day. For inspiration, I have seen some beautiful salvage quilts, there is a great idea in Sunday Morning Quilts for left over binding triangles, and there are so many possibilities for strips.
Right now they make pretty decoration in the sewing room.