Various Teams:

Go to the settings menu, then to the secret codes
menu and enter these 

Lionpower         '57 Lions
Goldrush          '57 49ers
Jollygreen        '58 Giants
Stables           '58 Colts
Getem             '62 Texans
Therewasaman      '62 Oilers
Megiveyou         '66 Chiefs
Champs            '66 Packers
Whoshotjr         '66 Cowboys
Blitzer           '67 Rams
Snowplow          '67 Packers
Tundra            '67 Cowboys
Heidi             '68 Raiders
Shocker           '68 Colts
Tvtimeout         '68 Jets
Nofluke           '69 Chiefs
MNF               '70 Browns
Overtime          '71 Cheifs
Lucky             '72 Steelers
Perfect           '72 Dolphins
Airshow           '72 Colts
Steelcurtain      '74 Steelers
Purple            '75 Vikings
Hailmary          '75 Cowboys
Dynasty           '78 Steelers
Holy              '78 Raiders
Roller            '78 Chargers
Comeback          '79 Cowboys
Ironman           '81 Chargers
Thecatch          '81 49ers
Tigers            '81 Bengals
Nochance          '81 Cowboys
Dantheman         '84 Dolphins
Upset             '85 Bears
Blowout           '85 Patriots
Flyaway           '85 Falcons
Shocker           '68 Colts
Thedrive          '86 Broncos
Wideright         '90 Bills
Neonlights        '91 Falcons
Comebackkid       '92 Bills
Notagain          '93 Bills
Charge            '94 Chargers
Defense           '96 Panthers
Almost            '96 Packers
Missedchance      '98 Vikings
Noluck            '98 Packers
The catchtwo      '98 49ers
Inthegame          EA Sports
madden84           1984 All Madden Team
86madden           1986 All Madden Team
madden88           1988 All Madden Team
90madden           1990 All Madden Team
madden92           1992 All Madden Team
94madden           1994 All Madden Team
madden96           1996 All Madden Team
98madden           1998 All Madden Team