As per my usual 'OverDoSue-ness'...a second Keyhole Scarf is waiting for casting on with larger needles. I love both Vanna's green and Bernat's rose with this skein of Unforgettable, and since I can't decide which one to use, I'll just use both.
I think the #15 needles will work for the extra strand of yarn. If not, I do have even larger needles. It will be fun to experiment, and besides I need the casting on practice. It has been awhile since I knitted. Like Vanna, I am first a Crocheter, and I will probably adapt this Keyhole knitted pattern to a Crochet pattern. Do you think Vanna would like a copy?