If Charles Schulz had written about a time-hopping Gallifreyian instead of a chronically depressed little boy, chances are his artwork would look like Larry Wentzel's. There's no Snoopy as K-9, but who wouldn't want to see A Weeping Angel Christmas?
I always figured that something vaguely sinister was occurring in the Peanuts universe. You could never tell what the adults were saying — was it some sort of backwater Silurian dialect? Also, I'm guessing the Great Pumpkin was some sort of shaved Yeti. In any case, the theme song would sound like this.