AJ Styles - Put him in the I-C/U.S. scene and then let him team/feud with the likes of Kofi, the Shield, Kidd, Gabriel and Bourne. Would book him against Bryan and Punk, but not necessarily as a major feud.
Samoa Joe - Another solid addition to the mid-card. Would have to get in a match or two with Bryan and Punk.
Austin Aries - See AJ Styles.
Bad Influence - Neither of these guys could cut it as singles stars in the WWE at this point but they are an entertaining tag team.
Bully Ray - Throw him in the upper card for a bit and then let him get a main event run against Cena.
Bobby Roode - Would push him strongly into the upper card and see how he connects. Maybe give him Heyman and book him how Axel should've been booked.
Kurt Angle - Part-time/Legends deal. Bryan & Punk feuds are a must. Maybe feud with or end up leading the Real Americans.
Jeff Hardy - Give him that RVD

type of deal. Rekindle the Hardy/Punk feud at some point.
Magnus - Would give him a strong mid-card push and then try to elevate him.
Velvet Sky/Madison Rayne - Need some more bytches.
Zema Ion - Lower card guy for jobs and to put on good matches with the likes of Kofi, Rollins, Kidd, etc.
James Storm - Another guy that could have a solid mid-card run.
Chris Sabin - See Zema Ion.
Gunner - This is the type of guy I'd think WWE would be all over if he wasn't already associated with TNA. Maybe keep him and Storm together as a team.
Sting - Legends contract. Work a few major PPVs, then retire and get inducted into the HOF.
Mr. Anderson - Would fire him live on the air like Coke Boy did Daddy Jeff.