My DM stopped and laid out each block before sewing it, and moved it around until she found the best one, after a while she knew what she was looking for to make the fancy things that some of them have, since I have done it before, I already knew what pieces to look for and where to put them to get the desired effect, since they are equalateral triangles there are three possible blocks, that way you can also see if you have some close cuts and change them to look like totally different ones. It takes a bit more time, but it gets faster the more you do.