You can find the link to all 99, 8 inch squares here: http://www.knotyournanascrochet.com/2013/04/granny-square-cal-week-one.html
I joined using the ch method which you can find instructions for here http://www.garnstudio.com/lang/us/pattern.php?id=4478&lang=us
The border was made up of 4 rounds of hdc. Place 3 hdc into each corner to turn.
The last round was a follows: Ch 5 (counts as first hdc and ch 3), sl st into the 3rd ch from the hook (to make picot) hdc into the same stitch, *ch 1, skip 1 stitch, sc into the next st, ch 1, skip 1 stitch (hdc, ch 3, sl st into the 3rd ch from the hook, hdc) all into next stitch.* Repeat around. Join to top of first hdc (ch 2) with a sl st. Finish off.