The BIG 4 Belt
Whoever holds this has the opportunity to trade the belt in for a Main Event Match slot at any Big 4 PPV(WrestleMania, Summer Slam, Survivor Series) near his way.
They also get to choose who they face in The Main Event. It can also be for a title
They don't have to trade it in whenever a BIG 4 PPV comes their way.
They trade it in at the right place and at the right time
That would give some more prestige to the BIG 4.