In order to be disruptive, you have to stay creative – constantly creating new ideas – disruptive ideas. What inspires you is very personal, but for me, there is nothing that inspires that creativity in my work quite like a Tom Peters book (or article or whatever).
So my advice (FWIW): (re-)Read something by Tom Peters (post-McKinsey!!) or something Tom-Peters-like (apologies to both Tom and my mother) every 3-6 months. It will keep you from becoming complacent.
Then go create something disruptive.
[My position: I disrupt. I create extraordinary opportunity. (6 words)]
BTW: my BHAG: I want Tom Peters to be my mentor.