WARNING! SPOILERS AHEAD!

Do not continue until you have finished Season 6, Episode 3!

After being shot by his dementia-suffering Uncle Junior, Tony spends a lengthy amount of time in a coma at the hospital. During this time, several people come to visit his bedside, leaving cards and other well-wishes. There is a card in particular which catches Tony's eye... And which really seems to get into his head! He really wants to know who wrote it, and so I would like to hypothesize purely based on some of the shots that I noticed.

Season 6, Episode 3

51 minutes, 39 seconds

Tony has just woken up, extremely disoriented. He and Christopher sit in his hospital room; Chris is rather talkative, while Tony is almost catatonic. Chris looks around the room, and then the frame shifts to a shot of the saying below, which is written in ALL CAPS, with a cheap, black pen, on what appears to be a yellow post-it note:

SOMETIMES I GO ABOUT IN PITY FOR MYSELF, AND ALL THE WHILE, A GREAT WIND CARRIES ME ACROSS THE SKY.
-OJIBWE SAYING

Upon reading this, Chris repeats it aloud for him and Tony. Then, the shot focuses even more closely on the quote. Ojeebwee saying. Indians, right?, Chris asks. The frame centers on Tony, still mute with shock of waking up from the coma. Who put this up? Chris asks Tony next. To which, this was Tony's reply:

The scene with Christopher ends after he bombards Tony with a business proposition, takes back the proposition, reminds Tony of Adriana's murder, and then leaves.

Season 6, Episode 4

2 minutes, 19 seconds

The Ojibwe quote returns early in the episode, as Tony is clicking for more morphine while having his wound dressed. He glances over at it after the nurse chastises him.

SOMETIMES I GO ABOUT IN PITY FOR MYSELF, AND ALL THE WHILE, A GREAT WIND CARRIES ME ACROSS THE SKY.
-OJIBWE SAYING

The nurse follows his gaze and reads the quote as well. Beautiful thought. Who put that up? she asks Tony half-heartedly. Tony replies with this facial expression, and a forced, My sister. Who else?, as he breathes heavily with pain.

Well, don't keep it up there if you don't find it inspirational the nurse chastises him again. To which Tony concedes, My daughter likes it. Well... Here we have our first lead: Did Janice put the Ojibwe saying up? To which I reply: NO! I may be imagining it, but there are two other points that I think help to prove that it was someone else...

Season 6, Episode 4

5 minutes, 20 seconds

A new scene begins only 3 minutes later, and Tony is still upset about the Ojibwe saying. Bobby and Janice are visiting him at night, and the scene begins with Janice complaining about her youngest daughter crying all night. Instead of feeling pity for Janice, he snarkily asks, Yeah, well why don't you ride on the f-ing Zephyrs and sleep on a cloud?, as he jerks his head towards the quote.

Janice, in her customary way, immediately begins to defend herself. What, you think I put that up there? I didn't. Tony doesn't buy it at all, Right. Who then? but at this moment, Janice quite conveniently gets a phone call and has to leave. This does seem rather suspicious; however, in this case, I do believe Janice. I think it's just a red herring from the producers.

Janice leaves, he begins to verbally attack Bobby instead, who tries to placate him. After chastising Bobby for leaving him alone the night of the shooting, Tony pushes his morphine button roughly 20 times... He's probably grumpy from morphine withdrawal. Let's move on.

Season XX, Episode XX

XX mins, XX seconds

I would argue that it was Tony's therapist who put the Ojibwe saying up on the wall. I say this because there was a scene during therapy in which Tony was discussing his resentment towards whomever put the saying on his wall. The scene suddenly cut from showing both Tony and Dr. Melfi, to a close-up shot showing Dr. Melfi's face. To me, this was an indication from the production team that she was the one who did it.