Well, this might be a completely trivial suggestion but, if the point is to get people using consequentialist thinking in their lives, why not have them each pick some big important decision in their lives (either an upcoming one or an ongoing one), preferably one they aren't entirely set in already or are uneasy with, so they would be more open to changing their mind, then get into groups and each take turns to discuss their decisions and options (hopefully without applying any judgement to them at this stage), then the other members trying to come up with as many new options as possible. Then they discuss the outcomes and benefits of each option and try to find the best one, not moving on until the entire group feels that the last person's problem was solved adequately. That way not only do they practice consequentialism in a practical way, they might get immediate help with a current problem which could end up being useful on its own and make consequentialist thinking seem more useful.