To promote the release of X-Men Origins: Wolverine, Marvel released a bunch of its titles with alternate covers depicting Wolverine in the styles of iconic artists. See if you can spot all the references!
Russ Heath and Juan Doe 
Gerald Parel 
Paolo Rivera 
Skottie Young 
Jason Chan 
Ed McGuinness 
David Williams 
Gerald Parel 
Laura Martin 
Fiona Staples 
Chris Elipoulos 
Juan Doe 
Paolo Rivera 
David Lafuente