I am sewing two 2" scrap blocks together as leaders/enders. The smallest scrap I keep in my "food chain" is 2" blocks. Anything smaller than that gets used as stuffing or is tossed. I always cut as many 2" squares from my scraps as possible. I keep them all mixed together in a drawer next to my sewing machine. I just grab two random pieces at a time to sew together. 2" blocks are the perfect size for leaders/enders and I really do save a lot of thread by using them. After they are sewn together and clipped off of my chained pieces I just throw them into a bin to be pressed and sewn together later. It will probably take forever and a day to get a quilt out of them, but little by little they are adding up quickly!
Sometimes I'll just grab a handful and chain piece them for something "mindless" to do! I love my Nova Montgomery seam guide (it's clear but you can see it in the second picture if you look closely). It really helps my accuracy, especially with these small blocks!