This square is called Puffs and Posts which is in the "50 Fabulous Crochet Squares" book. It is one of the few post-stitch squares I have made that doesn't pull in the middle/sides. I think it is because she uses longer post stitches than I have seen in other patterns.
Can't remember what the edge/border was like in the pattern, but I did a hc in the back loop only to give it a little texture at the end. I't a pretty square, and easy to do! My kind of square! Made in Vanna's Choice in Seaspray!