Round 12: Join Colour A in a sc that is in line with the centre of one of the six shells from round 3 (this will ensure that your centre motif is straight inside your finished square). Ch-3, one dc in each of the next 12 sts, *tc, tc, (2tc, ch-2, 2tc) in the next st, tc, tc, one dc in each of the next 21 sts*. Repeat from * to * 3 times (ending with 9 dc in the last repeat). Sl-st to top of beg ch-3. Finish off colour A.
Ch-3, one dc in each of the next 12 sts
My alternative start is join and chain 1, sc in same stitch, sc, sc, 1 HDC in next 4 stitches, 1 DC in next 4 stitches then continue from where I have added in the pattern above!
My alteration to this row is to try to help it go from being a circle to a square in a squarer way! so the changes are where the above italics are ie
Follow this sequence instead of the 21 DCs on each side of the square:one dc in each of the next 21 sts
1 DC in next 4 stitches, 1 HDC in next 4 stitches, 1 SC in next 5 stitches, 1 HDC in next 4 stitches, 1 DC in next 4 stitches (total 21 stitches)
For the last edge continue pattern from the corner and you should end up finishing with 2 SC for a total of 5 SCs in the centre of the edge (as per other sides of square). I was one out so just fudged it so I had the perfect stitch count (I think I had to do 2 sc in one stitch). Really pleased with the results of my alterations to the pattern (first time I've ever been brave enough!)