After seeing that mettā and P.J. Eby's Mmm Test could be connected, I crafted my own little practice that kind of melds aspects of both of them. After meditating for an hour in the morning I spend 2-4 minutes imagining an awesome far future, and then imagine doing awesome things to realize it.

For the far future I imagine a fun-theoretic posthuman civilization, with all sorts of exotic amazingness. I then imagine myself taking near future actions toward reducing existential risk.

I don't know how much this affects my behavior (if at all). The level of abstraction (even in the case of near future actions) might well be too great for this kind of thing to work. In any case, I get a kick out of trying to imagine new kinds of posthuman fun.