Any chants directed at Kobe will most likely have the opposite of the desired effect. I wouldn't suggest this unless the game is well in hand.
Also, booing Walton probably will be ineffective because he will think we are cheering him ("Luuuuuuuuuuke")...
I do like the idea of chanting "oooooooodd ooooooommm" - he is a notorious choke artist and will let this get to him.
"Faaaaaaaar maaaaar" would probably work too - but if LA chanted "Rooonnnndooooooo" especially when he was at the line, I have a bad feeling about how that would turn out.
Actually come to think of it, when Kobe has the ball i bet it would get to him if the entire area went silent - like dead silent. Methinks he would get all confused.
I will be chanting "OOOOOOODOOOOOOMMM" heavily in each game I attend. Y'all welcome to join.