long weekend afghan

This is another project I've been working on.  My middle son loves neon orange and is still at an age where he likes me to make things for him and has been waiting patiently for a blanket.  I have no patience for huge time consuming projects (I have been working on a blanket for my eldest for over a year now!) I have gone for cheap and cheerful acrylic yarn and a big hook!  This blanket could be worked over a long weekend (jubilee, anyone?!) and would be fine as a throw, or a picnic blanket, or a camping blanket...
This is a recipe more than a pattern (partly because it's not quite finished yet!) tha can be adjusted in size easily by changing the length of the starting chain (which must be an even number for the stitch pattern to work) and number of rows worked.
I'm a lazy so and so and put off or avoid sewing in ends wherever I can so I've written this pattern for minimal end sewing ;-)

Finished size will be approx 44" x 54", yarn used is stylecraft special double knit in graphite grey, neon orange and green.  200g orange, 200g green, 1700g (?) grey.  Four strands worked together throughout.
10mm hook.

1. Ch92, sc in 2nd ch from hook and across, turn.
2-9: ch1, sc in first, *ch1 sk1, sc in next st* across, turn
10: ch1, sc in first, *ch1 sk1, sc in next st* across, in last sc change colour to orange but do not break grey yarn!
11: ch1, holding orange yarn tail along top of stitches and working over the top to secure it in place, work a sc in each sc and ch1 space across, turn.
12: ch1, sc across, in last stitch pick up grey again, turn.  Cut orange leaving 6" tail
13: ch1, holding orange yarn tail along top of stitches and working over the top to secure it in place, sc across, turn
14-21: ch1, sc in first, *ch1 sk1, sc in next st* across, turn
22:  ch1, sc in first, *ch1 sk1, sc in next st* across, in last sc change colour to green but do not break grey yarn!
23: ch1, holding green yarn tail along top of stitches and working over the top to secure it in place, work a sc in each sc and ch1 space across, turn.
24: 12: ch1, sc across, in last stitch pick up grey again, turn. Cut green leaving 6" tail
25:  ch1, holding green yarn tail along top of stitches and working over the top to secure it in place, sc across, turn
Repeat rows 14-21
Repeat rows 10 -25
So that the coloured stripes alternate.  For my blanket I worked 5 orange and 4 green stripes.  After the last orange stripe work another grey section but make the last row all sc. 
Ch1, turn, sc across, work 3sc in first corner.  Turn and work down the long edge of the blanket working a sc in each row end and working over the grey yarn where it was carried over.  Work 3 sc in corner, and then sc across bottom of blanket.  Work 3sc in corner and sc in each row end up the long side.  Work 3sc in corner and join with sl st and fasten off.  Weave in ends.