Here are the links to all the game posters. Hope this is helpful.
Note: These links go to hi-res PDFs of each poster. While 11W is not licensed to sell these, there's nothing stopping you from going to Kinkos and printing these off.
Game 2 Central Florida: http://11w.s3.amazonaws.com/artwork/game-posters/2012/201202-game-poster.pdf
Game 5 Michigan State: http://11w.s3.amazonaws.com/artwork/game-posters/2012/201205-game-poster.pdf
Game 9 Penn State: http://11w.s3.amazonaws.com/artwork/game-posters/2012/201209-game-poster.pdf
Game 11 Wisconsin: http://11w.s3.amazonaws.com/artwork/game-posters/2012/201211-game-poster.pdf
Undefeated Poster: http://11w.s3.amazonaws.com/artwork/game-posters/2012/201213-game-poster.pdf
Thanks again to Walt for the tremendous work he put in on these posters. We're fortunate to have him as a Buckeye.