Boulder/crystal design

I am trying to add a design of a rough cut specific sized crystal/boulder to a drawing… does anyone know how to create one freehand or an import that can be amended in size and shape? Andy

Perhaps posting an image of what it is your wanting to do ?

There is probably many ways to create such a object. More details on the size, shape and purpose would probably help but the answer to your question is “yes” many people here would know how to do that.
Have you seen any “boulders” in the 3DW that are close to the shape you want or that would give one an idea?