Now there is even a new rule for it. Rule 63 states that for any female character, there exists art of a male version of the character, and vice versa.
Ming Doyle, a freelance illustrator, comic book artist, and self-imagined replicant, decided to take Rule 63 one step further. Doyle gender swapped famous DC comic book superheroes and villains with well known celebrities. Among the mix Geena Davis as Bruce Wayne and the Joker, Winona Ryder as Dick Grayson, and Gillian Anderson as Lex Luthor.
Doyle even got other fellow artists-- Lauren Moran, Joe Quinones, Jordan Gibson and Erica Henderson (many of them professional comic book illustrators) to join in the fun. The collection can be found under the Tumblr hashtag #DCBend.