I definitely use AVRT for my negative thinking. I tend to ruminate over things that are negative and unimportant (for example, I cannot stand my stepmother and will dwell on things she's done WAY in the past). There's another "beast" in me that wants to keep that "pain body" (Tolle!) alive and thriving and so if there is nothing currently wrong in my life, it'll try and drag up events from the past for me to dwell on and get angry over. It's been really helpful for me to separate myself from these thoughts, and recognize then as part of another "beast". In doing so, I have unintentionally become very grateful for what is good in my life.