I have seen directions to do as QuiltingHaven does, but use a very large fabric to start. If you want to make 100's of the same HST's, use fabric big enough to make most of them at one time. For the 3 1/2 finished HST's each section need to be 4 1/2. So two pieces of fabric 9" X18" RST would make 16 HST's. 18 X 18 would yield 32 etc.