For those that play the Pirates CCG by Wizkids Games you know how ugly the plain flat cardboard islands are. This will show you how to make some 3D ones out of some simple materials.
Also a good basis for making Warhammer and other gaming terrains
Step 1: Supplies
I used things I had around the house for the most part.
Styrofoam insulation board (Only because it is very fine grained and is easy to work with)
Plain Clay Cat Litter (unscented or any "extra" additives)
Sawdust (everything has a use) or if you want to buy static grass for model railroads.
Toothpicks (round ones are better)
Thin cardboard or card stock
White Glue (like Elmers)
Paints: Black, Gray, White, Green, Blue, Yellow other colors are optional.