So the photo below is my box of twosies made from onesies to ultimately form the 16 patches required for Patches and Pinwheels, a free pattern offered by Bonnie Hunter on her blog.
Just scraps, done on a light/dark formation and as leaders and enders.
What is a leader and ender? You know the piece of fabric you use so your threads don't get all caught up, well straighten them up a bit and make a quilt instead, putting these thru before the blocks of your main project! I've got 1360 squares sewn in to 680 twosies there which will make 340 x 4 patches which will then become 85 x 16 patches.