Hi,
Great idea!
I haven't used this with clients, but I've always thought the song "Drive" by Incubus is very ACT consistent.
Here's the first verse: "Sometimes, I feel the fear of uncertainty stinging clear And I can't help but ask myself how much I'll let the fear take the wheel and steer. It's driven me before, and it seems to have a vague, haunting mass appeal. But lately I'm beginning to find that I should be the one behind the wheel."
Could be used in conjunction with the monsters-on-the-bus exercise, or any number of exercises that focus on avoidance.
Mary