...and the rocks, and the grass... and the overall style, though I can definitely see some of yourself shining through in Calvin and Hobbes. If you couldn't tell by my profile image, I'm kinda freakin' love this comic.
I've often seen grown-up Calvin as a troubled yet successful artist in some way; by artist I mean visual artist, musician, or writer. Hell, maybe cartoonist? A kid cartoon who grows up to be a cartoonist: how's that for existentialism?