I have had 2 pieces of cork knocking about in my bits box, terrain related, for the last year and a half.
So I cut one in half added some hardboard bases, painted with a little masonry paint, for snow and then added sand and stones to the base.
All painted up mainly adding greys to natural browns of the cork, then stained around the base and in odd places.
To give a sense of scale, some models.
I have a box of cork, untouched at the moment so expect to see some more terrain pieces in the next few months.