We'll start with something light and kid friendly:
Nice, eh? It was done by Jack Davis for Sesame Street Magazine. Davis did cartoon art and illustrations for many print advertisements as well as magazine illustrations, most notably for EC and Mad. He also did a fair amount of movie posters and contributed character design work for the Rankin and Bass animation team.
Thank Mr. Davis for the excellent look of the creeps and heroes in the forever excellent Mad Monster Party.
And if you like fun, and really, who doesn't? Visit Sam Henderson's Magic Whistle Tumblr for more great finds and absurd humor.