Forcing paperwhites in water ready for blooming in time for Christmas (they take anywhere between 4 to 6 weeks). I pitched them to the children as a kind of alternative advent calendar - hopefully they won't bloom too soon!
I've never grown them this way before but apparently you can use pretty much anything to anchor the roots to keep the bulbs stable and submerged, as long as it's not metal. I used dollar store rocks and the children made their own versions, with plastic beads and marbles. And good old mason jars of course.