I am so in love with this pattern stitch...it makes a 3 dimensional shell or scallop...I actually think it looks like crowns. Its not hard to create but does take time. I think it would make not only a lovely afghan but a beautiful shawl done in fingering weight with a larger hook. The top photo is the front and the second photo is the reverse. The loops on the edges are for weaving a ribbon in and out of.
I wish I could share the pattern but if you are clever enough, you could probably figure it out as I did. If you need more help, check out the" Shell blanket disection" thread in the" Crochet On Ravelry" group....there are more photos there. Good luck!