Terrain tutorial this is good for moss on the dollhouse Scotty's Workshop: Inexpensive and easy homemade flock! Made from sawdust & paint you can use tea, oregano, peppar - this site has lots of gaming miniature ideas
Modular terrain boards are a great way to get started in wargaming terrain building. They can be pieced together or focus on a specific theme. Below is a great article on how to approach building some modular boards.