To make each square for the watercolour blanket use any 8 ply / double knitting / tapestry weight yarn, with a 3.5 mm crochet hook. I used skeins of left over tapestry wool, and found that each coloured square used about 7 m of wool. My blanket will be quite mismatched, as I have used any light coloured yarn for the borders (I like to think of it as a well-used paint box, with faded and stained plastic from repeated and cherished use).
Round 1: Make a ‘magic ring‘ and chain three times to make the first stitch. Make another 15 double crochet stitches into the ring (for a total of 16 stitches), and end the round with a slip stitch:
Round 2: Chain three times to make the first stitch. Make one double crochet into the base of the first stitch to make an increase (as shown)
Put one double crochet stitch into each of the next two stitches, then make two double crochet stitches in the next stitch to result in an increase. This is the beginning of one of the four sides of the square. Chain one, and then repeat for the next three sides (two double crochet in the first stitch, one double crochet in each of the next two stitches then two double crochet in the next stitch, followed by a chain) and use a slip stitch to end the round:
Round 3: *for the first “side” of the square, I have found it best to start with an increase as it sits better when finished (as shown). This side will be stitched slightly differently from the other three, as described below.
Chain 3 to make the fist stitch. Make a double crochet stitch into the base of the first stitch to result in an increase. Stitch one double crochet into each of the next 5 stitches. Stitch two double crochet stitches in the gap formed in the previous round. Chain one to finish this side of the square.
Complete the next and remaining two sides as follows: two double crochet in the gap, one double crochet in each of the next 6 stitches, two double crochet in the gap, one chain stitch to end the side.
Finish the round by crocheting one double crochet in the gap, next to the first stitch, and finish with a slip stitch:
Final round: join the border anywhere along the side. Double crochet in each of the stitches, and complete the corners as in the previous round (two double crochet, chain, two double crochet). Complete the round with a slip stitch and weave in the end of the thread.