So I thought I'd share my setup for the kind of photos I've been taking every now and then. So here's the scene, from a different angle, just before the flash fires. I set it up again today, so I could take this pic.
A standard size pizza box, around 0.5KG of baking soda, Legos (obviously), few paintbrushes. The rocks are made of newspaper painted black. A small strainer also comes in handy to spray the snow around.
And see those miniature trees in the background? Wife bought these for me, and I must admit this was one of the weirdest gifts I ever got. But it was so surprising and awesome in the same time.