Roy Thomas’s Alter Ego Fanzine, Vol. 1 had a cover that began life as silver-age Justice League of America jam commission:
Hawkman is by Joe Kubert.
the Atom is by George Perez.
J’onn J’onzz, the Martian Manhunter is by Dick Giordano.
the Flash is by Nick Cardy.
Black Canary is by Ramona Pradon.
Green Arrow is by Joe Grielle.
and Green Lantern is by George Tuska.