Couple of things. How many kits are you planning on purchasing per quilt? To piece square blocks into a circle, you are going to have to deal with angled cuts, and you need to know how many blocks you are trying to arrange. If you are a novice quilter, this might be tricky. Also, you said, "make them into a circle with a quilt design around them" By quilt design, are you talking about a pieced design, or the design made by the quilting stitches? If you are talking about the quilting stitch pattern, you might want to consider appliqueing the completed blocks onto a whole cloth backing. In other words, purchase wide backing fabric (108 - 120") embroider your blocks, arrange in a pleasing pattern on the large fabric & stitch them down then quilt.