2. The first thing you need to decide is how big you want your blocks to be. Roughly speaking, your finished CW block's side will be about half as big as your material you cut for it. So if you cut an 8" square of material, it will make a finished CW block that is about 4" square. So as you can guess, these do take a lot of fabric. But remember that these are a quilt-as-you-go project, meaning that you do not have to buy the backing material or the batting. The reason you don't need batting is that you are folding these raw squares into 4 layers of fabric plus the window fabric, so it will be plenty warm (and heavy) without the batting. I cut my raw squares in 8.75" squares, simply because that was the most I could get out of 44" wide yardage less the selvedge. So my finished blocks are slightly larger than 4" each. Below is my stack of 8.75" squares, ready to get started.