That's a nice blanket, you might try searching at ravelry.com (free to join) and find something similar. You might have to find a pattern for a smaller yarn and adjust it for the yarn and large needles that would take.
Cheating is an option. . . . Cheaters never win and winners never cheat, but smart knitters who want to retain an iota of sanity do, cheerfully. ~~Kory Stamper