iZOMBIE VOLUME 1: DEAD TO THE WORLD includes some really cool extras in a section called Allred’s Secret Art Vault.
As Mike says, this is his favorite unused cover idea.
And here’s another.
Maybe they will be completed and make the front of an issue some day. Wouldn't you like that?

Editorial
Allred’s Secret iZOMBIE Art Vault
BY: DCE Editorial
Wednesday, March 23rd, 2011