I recently taught a class and everyone used three fabrics. Color one was the four corner blocks that is the predominate color that won't be cut. Color two (the strip after cutting) was the center block on the top and bottom row of the nine patch (and the first and third block in row two/middle row). The center block is the stand alone color that is being cut down into the smaller square. The individual block size is 4.5 and unfinished block is 12.5 ~ the participants are making 35 nine patch blocks and the finished size of the quilt is approximately 60 x 84 (5 across and 7 down). Hope this clear and helps, if not PM me.