I was in the process of making one (just about to move from Photoshop to ImageReady, the nose moving is essential), when my computer said... Well it didn't say anything at all it just shut down.
I sighed and pressed the power button, readying to start over, but it was dead, like a stone, or a worm that just got crushed by one.
Result: I had to dig out an old iMac from a closet, and it's uses are very limited. No christmassy avatar for me