I've made the chevron pattern before, so this was only challenging in that it changes from a double crochet stitch to a single crochet stitch and she decreases the last stitch of each row.
My version, using Red Hear Super Saver Stripes:
I know if you make this into a blanket, which I've done, it doesn't look like an M. I made a baby blanket with Bernat yarn using a similar Chevron stitch.
While I've had trouble with a couple others, I've never had one take me 3 days to do. On Monday, I tried multiple times, unable to manage the stitch or the count. On Tuesday, I was very tired and frustrated, but all my attempts were sad things. Unraveling is my friend.
Finally, I managed this:
It doesn't look too bad, but it feels messy to me. Also, I'm annoyed with the constant curve that seems to happen with the chain row.
So this stitch was not hard at all, but my yarn gave me some grief. I'm not a fan of this yarn. It's too loose and has no backbone, as I call it. Still, you can see the pattern.
I just followed this video from Creative Grandma. It's very easy to do and she provides, as usual, the written pattern at the end.
I didn't like how my previous swatches in January looked, so I have a new one. Other than being too tightly chained, again, it came out very nicely, I think. Here it is:
This is fairly complicated. I don't like how my yarn turned a bit, looking like a crescent moon unless I pull the lower corners straight.
It's hard to see with the variegated colors. But it wasn't really too hard to make.
UPDATED Feb 28th, 2016: This is my newest version and I think it's much easier to see the pattern.
This is fairly easy to master. You just need to be comfortable with the double crochet stitch.
The pattern for the Shell by Shell Stitch by Creative Grandma is here. She has it as #201, but it's my #5.
This is my version:
I am using up my leftover yarn. I really like how this came out and may continue it for kicks. I don't have much of that solid blue yarn, but I'll use what I have since it goes so nicely with that variegated yarn.