Making molds and casting rocks are both clearly covered here, but the major emphasis is on different techniques for blending those castings together plus simple methods for painting the finished rocks for ultimate realism.

Following the simple steps in this video clinic will allow you to build a small section of realistic rocks---or you can build a sheer cliff of rocks.

The two scenes shown below are taken from the actual video itself.

Two different, effective and easy methods of blending rock castings together are carefully explained and demonstrated in this 70 minute video clinic.

After the blending work is done, three different methods of coloring the rocks are covered.  All use simple cheap brushes and just a few acrylic paints.  All readily available at places like Michaels.

After the rocks are in place and colored, a demonstration is given on talus piles or talus slopes.  This is the accumlation of small (and some big) chunks of rock that fall off the face of the cliff and get piled up at the bottom.

If you have ever wanted to improve your rock casting techniques, this is the video for you.

Thoughts about layout lighting and where to get good ideas for making your rocks more realistic is included as well.

Rock casting and coloring products used are clearly explained and recommendations given about my personal preferences.