"The Walking Dead Poster" by Andy Helms
"Typographic Poster For The Walking Dead" by Gabriel Marques
"It's Walking Dead Time!" by Robert Barnett
Before the first season aired, I came across these fan-made introductory titles, by one Daniel Kanemoto. While I've definitely warmed up to the title sequence that ended up on the show, I'm still pretty fond of these. Check 'em out!