I've just come back in from Christmas shopping so please cut me some slack as I'm feeling rather grumpy
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I don't like any pictures or animations in signature lines, they make the forum look like a comic book for 6 year olds or perhaps 18 year old ricers. Actually most signature lines are a complete waste of space as well.
Having said that, I think that it would make a great avatar. While I'm in my "rant" mode I'd just like to add that regarding movement, subtle is best. In fact I'll give Jack a 100 out of 100!
Now let me get back to wrapping your gifts.