Hmmm...that would be pretty tough since cork board isn't very easy to cut and shape. You might be able to create some good looking rock formations and the like. I cant really think of anything else you would realistically be able to use it for.
Tzeentch Lord said:The only thing I can think of is to break it up into tiny bits and use it as rubble or gravel on hills or ruins. I don't think there's much else you can do with a thin sheet of cork!