Good idea. I do that with all of my "FMQ warm up" squares. (I use FQ for these) After you fill one up with warm-up stitching, just cut it in half then in half again for very manageable sized pot holders, or cut them to whatever size you want. (I have just squared a couple off for place mats or large hot pads.) Use some of those deco stitches on the machine and they are great quick gifts. They also make good burp OR changing pads for Moms of babies.
So don't throw them away... trash to treasure Dear. :D