I have made fleece blankets. I take two pieces. must be the same size. For a baby blanket I generally make it about 36 inches long, for an adult, I make it 60 inches long or longer.
With the two pieces together, in each corner, I cut a 5 inches square and remove the material. From there I cut the strips 1 inches wide x 5 inches long all along each size (as I get to the end I make sure that the strips are about the same size or readjust the strips). I tie the two strips on each side before going onto the next side. I make sure that I pin the entire blanket before I do the cutting so it does not shift.
I hope that this make senses to you.
Barbara