I like Jim! It's good to see he's getting some votes.
I think the "coolest" Av I've ever used was the Tolkien device. I really dig it.
The Gandalf comes from another forum I frequent. You HAVE TO use a cartoon-ish av or none at all. This is the av I use there:
Unfortunately it doesn't fit here because the sword makes it too long.
Bonus points for anyone who can name Gandalf's sword.