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Step one... we draw an outline, any outline. Some basic guidelines to follow are:
- always make it asymmetrical (as in not symmetrical, as in not a mirror image along any lateral or radial line) unless it is man made
- many rocks have a chiseled look to them, try to keep fairly sharp edges
- don't get too fancy
Here are some outlines I drew:
 
Well, they aren't too good, you all could probably do better if you put some time into it.
Now we color them in:
 
Now, we do NOT add a noise effect, but instead choose a light source and imagine where the light hits it. I will again do a top right one:
 
If you examine the picture you begin to get a better feel of how the rocks actually look, where they are concave and where they extend out ward.
 
I have now added a third shade, they now have some good depth, but look really smooth (you may want this though)
 
Here I cleaned up the lines and roughened them up a bit.
 
You may make your rocks any color you want, but I would strongly advise against going crazy with it.
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