I think the best use of the back of the shirts would be to list Pats and other teams offenses and punishments, listed like you see concert dates and locations on rock band T-shirts.
Patriots - Camera in wrong place - 1st round pick forfeited and $750,000 in fines
Rats - Tripgate - $100,000 fine
Seahawks - Hiding injuries from injury report - Warning
Broncos - Taping the 49ers pre-game walkthrough - $ 100,000 fine
Giants - Using walkie-talkies to communicate during a game - 4th round pick degraded 12 spots at most
Pats - Footballs being under pressure due to IGL - 4 game suspension for Tom Brady and forfeited 1st and 4th round draft picks
Chiefs - Tampering with a free agent early - 3rd round pick forfeited
Giants - Player viciously abusing spouse - Rule calls for a 6 game suspension, but player was suspended just one game
Steelers - Footballs found to be under pressure - Probably due to low temperatures, but never investigated and no punishment
Colts - Sticking a needle in opposing teams' ball - No penalty
Giants - Sticking a needle in opposing teams' ball - No penalty
etc
etc