Yup. The skillbuilders as some have given you links for. I've got two, have used one. At first I was hoping they were like the pre-printed whole cloth designs that will wash out after you've quilted them, but now I don't really care because I use it strictly as practice ... and I've practiced a lot with thread combinations - some of which clearly did not play together well. So it has turned into something pretty ugly
Yes I like it, yes I used the designs, yes they helped for the most part.