Here's an illustration from one of the early FOOM fanzine issues. Can you guess the name of the artist?
It's by Jim Steranko! Featuring the Hulk strutting down the street with a FOOM membership card in hand. Steranko was doing a take-off on another famous image that originally appeared in 1968.
Robert Crumb drew Keep on Truckin as a one page strip in Zap Comics #1. You've probably seen this on various truck decals and mud flaps over the years. According to this Wikipedia article, Crumb never made much money from his creation. Nuff Said!