Here's a few:
Mike Gaechter - played 8 seasons, had 21 career interceptions playing corner as a rookie, and then strong safety. Had a 100 yard interception return as a rookie, and had his career cut short by an Achilles tear in his last season.
Larry Cole - indispensable role player as an end and tackle for many great teams. He played in five Super Bowls, and it was his tackle for a loss of John Riggins on a third and short play in the 1979 game that set the stage for Roger Staubach's final 4th quarter comeback.
Blaine Nye - started at guard for 8 seasons, and was a key cog in the offense that won Super Bowl VI. Besides, he was one of the founding members of the Zero Club!!!
Preston Pearson - literally invented the third down running back position with his pass catching skills out of the backfield. First player to play in Super Bowls with three different teams (Colts, Steelers, Cowboys). Former college basketball player at Illinois who transitioned nicely to football.
Kevin Smith - prior to the Achilles tear, he was one of the best cornerbacks in the NFL.