I'd like to see Calvin's and Hobbes' heads. I'd also like Spaceman Spiff, Calvins imaginery own hero image as well. But I guess you'd need permision from someone to use them.
A few more birds wouldn't go astray either.
And how about some kind of fish?
A wombat and frilled-neck lizard would look pretty good.
And I'm hanging out to put this
drum(EPS format) logo in my handle, although little Tux is a cuttie.