For the edging, you can follow this pattern:
Rnd 1 (gray - around the entire edge of the blanket): sc, ch 3, repeat until end of rnd, sl st in first sc.
Rnd 2 (gray): Ch 1, sc, 2hdc, sc in each ch 3 section, sl st in first sc.
Rnd 3 (yellow): Ch 2, *hdc, 2 dc, hdc*, repeat from * to * around entire blanket.
Fasten off. Weave in ends.
That's it. It's not my favorite blanket ever, but it's still pretty. And I think it'll be a little warmer than my previous Granny Ripple Baby Afghan. Can't wait to send this one to my aunt as well!