I work the same way as scraphq. I have a QS 16 patch and pinwheel quilt laid out on the floor (my design wall) while I make the final 5 pinwheels and then sew it together. Pattern from
www.quiltville.com - a great source for scrappy ideas. My blocks are made from 2.5 inch squares and 4.5 inch HST blocks. While I was sorting out scraps for these final blocks I also sorted out scraps for two other projects and strings for heartstring blocks.