St. John's Weird Horrors was a pretty bog-standard 1950's horror title...nothing to distinguish it from the countless others on the market at the time:
William Ekgren got to pencil and ink the covers...and they were like nothing seen before or since:
He also did the cover for Strange Terrors #4 (1952):
As far as GCD can tell me, these 3 covers are the ONLY things Ekgren did for the comics industry.
Of course, once I finally do a Google search, I find another blogger has already done some amazing research in tracking done the history of Ekgren. So head over to his crib to read more about the amazing artist who--ever so briefly--dabbled in comic books.