Your Christmas quilt is just beautiful. I personally don't care for the quilt as you go method, so I guess I would just put sashing strips bewteen my blocks. So, if I just randomly pick a bunch of "do-able" 12" blocks from this Quilter's Cache, how do I know how much yardage of fabric to purchase? I guess I've been spoiled by the convenience of patterns, where the yardage requirements have been worked out for me in in advance. I unashamedly admit that I am not much of a math wizard.