Storm at Sea patchwork in crochet

In allowing access to this pattern, I grant the right to make this blanket for your own use or as a gift. It would be a joy if I was acknowledged as the designer. I reserve all rights to the images.

This design uses three different blocks to create the large block -
Diamond in a square (4), Diamond in a rectangle (4) and Square/Diamond/Square (1).

I have used English terms throughout. There is little if nothing original in what’s been done here. You’ve probably used most of the techniques used.

This design can easily be made in any size because it is only dictated by the size of the diamond in the square – simply make that to the size you like and the rest will work from there. The Diamond in a rectangle is the size of two Diamond in a squares side by side. The Square/Diamond/Square will match the long side of the Diamond in a rectangle.  
INSTRUCTIONS
Work the Diamond in a Square first. You can make the diamond (square) in any way you like. Cast on some chain to the desired size and work rows of dc back and forth; make a granny square. Anything will work. I prefer to have no holes to distract from the blocks of colour in a patchwork design.
I have made mine like this – into a chain ring, work 2 tr, 1 ch, (3 tr, 1 ch) three times, 1 tr, sl st to top of beg. Work 3 rows of dc ending each row with a sl st to beg and working the corner by working dc into the ch st, turn work 90 degrees - see my tutorial within this pattern: http://www.ravelry.com/patterns/library/granny-square-w-flat-no-hole-corners
work 1 ch, 1 dc into the same st, then continue to work 1 dc into each st.
Now work the corner triangles in a contrasting colour –

Row 1: with right side of work towards you, join with sl st in corner ch, ch 1,
DEC (draw up a loop in this st, then draw up a loop in the next st, draw through all 3 loops), dc into each to last 2 sts, DEC in last 2 sts. Turn.
Row 2: ch 1, DEC, sc in each st to last 2 sts, DEC in last 2 sts. Turn.
Repeat row 2 until 1 dc remains. End. One triangle is complete.
Repeat on all sides

Use this square as a template for the centre of the Square/Diamond/Square.
Then work 4 triangle corners as above in first contrast colour. Then work 4 triangle corners as above in second contrast colour.

Diamond in a rectangle
Work 2 ch, 1 dc into the 2nd ch from hook, turn. Work 1 ch, then increase into next (last) st (2 dc into st), turn. Continue working 1 dc into each dc, increasing into last st, until the edge you are working matches the width of the Diamond in a square. In my example, until there were 17 sts. At that point, begin working in the same way but decreasing at the end of each row until one st remains. Break off and draw through.
To make the corners of the rectangle – join to one of the sharp points, 8 ch, 1 dc in 3rd ch from hook. **Work 1 dc into each dc to last 2, DEC (draw up a loop in this st, then draw up a loop in the next st, draw through all 3 loops). Sl st to diamond one row up from join. Work 1 ch, sk next row, sl st to next row on diamond. Turn.
Work 1 dc into each dc. Turn.
Continue to work these two rows until 1 ch joins to the blunt angle.
Reverse this shaping, working increases at the end of right side rows instead of decreases.
Continue until all four corners have been worked.

I would join the elements with a row of dc on the right side of work to give sharp lines to elements of the block.

I hope you enjoy.
Toni
(Justdunny)