You will need:
2 balls of double knitting, one of each colour.
A 4mm crochet hook
A darning needle
Finished measurements: 58 cm wide and 78 cm long (but you do not need to be too precise about this!)
Using Colour A, make a chain of 93 stitches (90 to crochet the pattern into, 3 for the turning chain).
Row 1: still using Colour A, miss 3 chain. 3 trebles (tr) into next chain, 1 chain (ch), miss three chain, 3 tr in next chain. Repeat til end of row; 1 tr into last stitch of row (you need this to give a firm, even edge).
Row 2: still using A, 3 chain. 1 tr in first chain from hook, 1 ch, miss 3 chain, 3 tr in space between previous row’s groups of trebles. Work 3 tr into these spaces until end of row; 1 tr in last stitch.
Row 3: join Colour B to do 3 chain. Do not cut Colour A free, but just leave it at the end of the row. Work the same pattern along the row.
Row 4: using B, work the same pattern back along the row.
Repeat the pattern. Between rows, at the edge of the work, twist the colours together once or twice, close to the edge. This will keep the edge flexible and make sure you don’t have huge loops of wool where you have swapped colours. The edges will look like this:
You need to use your judgement here, to make sure, according to your own tension, that the blanket will lie flat and not curl up.
Using Colour B, do a row of DC along the short edge of the blanket, one DC in each chain. At the corner, do 1 DC into end stitch, then 2ch, then 1 DC (all into end stitch).
Then, all you have to do is to darn in the ends!
Close-up of the corner, and border, is below, as well as a shot of the completed blanket! Happy crocheting!