Hmm ...
Dean Ambrose & CM Punk
Sheamus & Wade Barrett
Chris Jericho (if he turns fully face) & Damien Sandow
Tyson Kidd & Antonio Cesaro
Christian & Dolph Ziggler
Cody Rhodes & Seth Rollins
Daniel Bryan & Chris Jericho
Heath Slater & Santino Marella
Seth Rollins & Drew McIntyre (I realise that they've had a couple of matches together but, I'd love a full on feud for the NXT title between them two)
Curt Hawkins & Trent Barreta
Bray Wyatt & Kassius Ohno