The campfire is actually semi self made I had a picture of a burnt logs and then used a rock texture to draw the rocks around the campfire. It is actually quite fun way to create rocks as you can create single rock or pile of rocks depending on how much you paint (you just remove the unwanted pieces if you draw too much). Then just add drop shadow and a bit of bevel to make them pop out. It is a lot faster way than adding individual rocks and I'm currently working on creating similar texture for bigger rocks too.
I have also taken several photos of a tree trunks and other objects to create reasonable library of self made objects. So it will take a while before I get a reasonable update to this map as the background work takes so much time.