I don't have an answer, but I'd be interested in hearing what answers you discover. I was talking about this very thing with my therapist today. We've come up with one or two ideas that would not be generalizable apart from us, but I think it's an issue that will come up again.

At one time, I bought the "Ungame" with his permission, and it still is on our "if all else fails" list. But we'd both prefer not to rely on aides to spice up our sessions if we can help it. Although sometimes I wonder what would happen if we just sat on the floor and played Jenga or something. I have a feeling that it might provoke sessions that are a bit different than sitting properly in chair sessions.

I also made a set of flashcards of the big issues in my life. The idea was that on occasion I would reach into the envelope and choose a card at random to delve into something that might not ordinarily come up in conversation. They're out of date now, but it might be worth considering again.