How to make a simple sprue rock.

Tools:

First, snip off a little green stuff. If you stretch it you can get two rocks out of one strip about as big as shown above in the tools picture, but if you want more detail just use the whole snip on one sprue.

Next, wrap the greenstuff around the sprue. The sprue will give it a basic frame . You'll also be able to use minimal greenstuff this way.

Next, shape the rock. I chose to go with a flat, craggy style of rock, but you can go with round, sandstone, textured, however you like.

Lastly, Find a miniature to complement your wonderful new rock.