I've never had a lucid dream, but I don't have nightmares either. 80% of the time my dreams are just abstract thoughts and still images. Just a bunch of concepts that make no sense, almost as if when I dream I am trapped in 3 dimensional world with no way of traveling through the fourth, which is time. And even then that's if I'm in the dream, I'm not always, sometimes my dreams take on a third person view as if I'm just an observer. It's really kinda weird now that I think about it, but it doesn't when I'm in the dream.
As an example, one of the last nightmares (sort of) I had was actually almost two years ago. I was sort of sleeping on the couch in a very uncomfortable state, and there were two lamps around it. Throughout the night, I could not stop imagining that those two lamps were my mining facilities and I had to protect them as they were being attacked. But I didn't have any combat units to send to the facilities so I was screwed. It lasted the whole night, I could not consciously do anything, as nothing ever happened. Just a constant state of "oh crap I'm about to lose my only sources of income". I know it lasted all night because I sort of woke up several times that night and kept coming back into that same dream.
One of the best dreams I had was also like this. There was this airplane, a Boeing 737 to be exact, and I just imagined it moving through the clouds. I could control it with my mind, even though I was not really in the dream. It's as if I was the airplane, but the pictures in my head were of the control panel and a window view looking out at the left wing.
Perhaps the absolute best dream of all time was this next one I'm going to describe right here. It was a long time ago, so I don't remember any details at all, but I have to say it has truly been the most inspiring. All I remember are pictures of it. Stars, planets, and moons that came entirely out of my imagination. When I woke up I was shocked with amazement. Somehow I had experienced the massive scale of space, huge expansive distances and all sorts of beautiful nebulae and asteroid fields. I'm not quite sure what this feeling is, but I've only ever had it once, and it was that morning.
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Remember, all atrocities begin in a sensible place.