If you want to make it yourself then I would get some food coloring and a few pastry bags with different tips. You could use malt balls for rocks or boulders and you can make shrubs and grass with the pastry bag tips. Its really very easy. Just don't squeeze the bag too hard a slower pace is better. You can even make a steam with a pastry brush and blue food coloring. You could also use crushed oreos as dirt if you wanted.
