Here is a link I found that shows how to crochet holly leaves: http://www.craftown.com/xmascrochet/pat6.htm. I think with some modification you can make this pattern work by making the middle one longer and adding a few more short ones to the sides.
I was trying to make a leaf for a rosette the other day and my experiment looked too pointy for a rose but may be perfect for what you want. Here are some rough directions:
Ch 20, tr in the 4th ch down, tr in next 5 ch, dc in next 5 ch, sc in next 3 ch, sl stitch in next 2 (now you have finished one side and will work down the other)
Ch 3, sl stitch in next 2 ch, sc in next 4, dc in next 4, tc in next 5, sl stitch in the 3 chain of the first side. Done!
I think this would work for the middle leaf. For the other little leaves try chaining 15 and just using double and single crochets. Sew them together in formation on your blanket. For the stem I would chain to the length you want and then single crochet down the chain and back, then sew that down below the leaf to your blanket.
Here is a picture of what the big leaf would look like (obviously yours would be green !)
If you need it to be longer just block it and stretch the hell out of it! Good luck Big_Worm!
And to all of those who might be thinking of posting some nasty response to this thread, give it a rest. I will not respond to that kind of thing.