ending with stretch

I've had my leafy neckwarmer hanging off my needles waiting for the cast off for at least a week or two now. I wanted to use the same elastic cast off I used on Ezra's mittens. It was easy to do and gave it a good stretch ending so it stretches like the rest of the knitting. Only I couldn't remember how I'd done it. So last night I finally decided to seach youtube again to find it. And so I did. And I did the cast off. And I thought I'd share it.
This is the youtube clip I found. I liked this one because you just keep knitting with your needles. No need to change to any other knitting tool. It's not complicated either.

K2, RnK2tog (Right needle knit two together--like you do the 'k' of the 'ssk'),

K1, RnK2tog, K1, RnK2tog, K1, RnK2tog...etc.

It stretches nicely. As much as the cast on end.

So now my neck warmer is ready for some blocking and edging. I found a leafy edging in my Knitting and Crochet Bible that I decided I must use. That's next on the needles.

What stretchy cast off do you like using?