The perfect way to end Season 6:

In the finale, have the FBI team get caught up in an intense series of serial murders. The killer taunts them with letters, messages, etc. throughout the case.
Towards the end, have the killer send them a letter in a cypher that tells them where his next victim is, and also gives them how much time they have until that victim will die.
Time is ticking, and the whole team is attempting to break the cypher to no avail. Suddenly, Patrick figures it out.
We see a quick series of flashbacks that explain how it was the first cypher his father ever taught him.
The team rushes to the location that Patrick figured out.

They break the door down on the front of the building/house.

As they break the door down, Bach's Prelude in C (the song that Rosalind Harker always played for Red John/that Red John always played to mess with Patrick) begins to play.

They search frantically through the house/building, and finally they reach the end of a hallway with a closed door.

The camera angle switches to inside the room at the end of the hall, and we see the door open and the team enter with their flashlights/guns. Patrick is behind them all. Finally, we see everyone holster their weapons and Patrick enters.

We see a look of fear and worry on his face - the look he gets at a real Red John crime scene.

We then cut to a shot of Rosalind Harker playing the end of Prelude in C on piano.
The camera pans out, and we begin to see a man grab a teacup from a table.

Cut to black as the last note of the song plays.

"Executive Producer -- Bruno Heller"

Then he has to spend a whole season making up for the pathetic shitshow of the Red John reveal from this season.