Any scrap piece that is about fat-quarter size gets folded into an approxiamate 5" square and stacked on my top stash shelf in a closet. Anything smaller than that gets cut into 2.5" squares and put into one of two shoe boxes. One box has no duplicates of fabric, and the other has many of the same fabric. I belong to a swap of these squares on this board. This year on my birthday I will receive 1,800 different fabric 2.5" squares from all of the swappers. I put them in the no duplicates shoebox. On their birthday I give them 50 different squares from my shoebox with many duplicates. This way I have thousands of 2.5" squares that are not duplicated stored in a shoebox. When I'm ready to swap, I get those squares from my duplicates shoebox.
I hope all of that makes sense. Bottom line I have the 2.5" squares in two shoe boxes. The pieces that are a little larger get stacked on shelves.