I used the fabric, each month I bought an addition foot of each fabric. Then I just made more blocks out of the fabrics so that I had enough blocks to cover the entire bed. I didn't want 12 blocks set together with 12 or more giant hunks of fabric or border after border.
Don't forget that during the CW as with any war, supplies were hard to come by. People used any piece of fabric that they could to make clothing with. What was left over was put into quilts. So, tiny pieces in your blocks? Thats great. Don't have enough of one fabric? piece it together with another and cut your block piece out of that. In a CW quilt as long as you stick to the repro fabrics and don't stick batiks or something similar in it will be okay. Want to add something else "era appropriate?" Use strips of your left over fabrics (some of everything) in varying lengths to make your binding.