I used lego digital designer to try out new techniques with rock building and wall designs. It's not terrible...considering there is not an entrance to the castle.
About this creation
I upload this to share my attempts at rock formation and wall designs, but since I am limited by the pieces I have, I used the LDD to do it. It's neat I suppose. There are 1968 pieces used in this model, and if it were to be purchased from the lego.com it would be approximately $480. I don't think they implemented this feature to get good bargains on pieces.