I’ve always found it a little surprising how unthinkingly we use helium, when it really is in short supply on the planet. Party balloons are fun, but at some point I do expect the price to rise to the point at which it will only have industrial uses (including for space activities). It could certainly liven up parties if we switch over to hydrogen balloons…

There’s plenty of helium to be mined out in the solar system, but it would be an interesting challenge to import it back down into the gravity well. I suppose it would just be done in pressurized tanks.