OK, I don't know what happened on this one. I was planning to try to make a flower shape and it started looking like it could be a cube. I couldn't keep myself on task, and ended up following through with that thought, and all of a sudden, I had this small symmetric boulder.
I'm not sure it deserved its own post, but to make an honest log of my efforts toward a new design, I guess it has to be here. Here are my tries so far: