Why try, Sophie. Just leave them alone and you will soon have more Chionodoxa than you would ever wish for. They are a rather invasive plant.

Do the pods just open and spread the seed themselves?

The seed pods dry out and the seeds germinate in Spring.

Yes they will. Sorry for trying to put you off doing some propagiting, Sophie, that was bad of me and I should have been encoraging you.
At the moment the pods are soft and green and the seed is not yet ripe. You need to keep an eye on them and in a few weeks time you will see some splitting open and spilling seeds. Collect the seeds that you want and prepare to sow them. You will not need a large pot, something like a three inch square platic pot will take quite a lot of seed. Nearly fill the pot with a soil based seed compost, sprinkle the seeds over the surface and cover with a thin layer of compost. Label the pot and leave it outdoors in a shaded place. Alternatively, for small, round bulb seeds I now fill the pot with compost and stick my thumb into the middle of it to create a half inch deep hollow. I tip all the seeds into this and cover with compost. As the small bulbs grow they push themselves appart to make space. It may be three years before the bulbs get to flowering size and at some point you will need to transfer them to a larger pot.

Thanks very much for this. I've not had much luck with cuttings, so thought I'd have a go at some seed growing.
Last year's hellibore seeds have now germinated, which have made me want to try more.
I'll wait till they've dried out, (if it ever stops raining).