I don't save them. I usually cut my selveges and use them as markers or labels for WIPs -- just write what I want with a Sharpie. I may be missing something here, but all of the selveges I look at don't seem wide enough to make anything out of. By the time you even up the edge and figure in your seam allowance, you almost don't see any of it and it ends up looking like a regular strip of fabric.