Ooh, dreams! I get those!
Mine tend to involve myself in a) certain situations that are way too close to reality that I almost think I'm actually awake, and b) landscapes (real or fictional) that I tend to explore.
For example, one time before my classes, I dreamt that I went through my entire morning routine and for a second thought I was already awake... until I heard my alarm in real life and actually woke up. That had me confused for a good 10 minutes.
Another time, I found myself inside a cosmic library. It was a very old, but well-kept looking library, with multiple floors, but very little visitors inside besides myself, and not very many windows. One time while I wandered I found myself in a long hallway with rows upon rows of windows, and when I looked out, I saw nothing but galaxies and space surrounding the library. It was very pretty, and if I was at the level of profession where I could accurately draw what it looked like, I would in a heartbeat.