I've had two dreams that I can clearly remember, at the moment.
The first was a crossover of Halo and Stargate: Atlantis. It was pretty interesting, it had 3 Spartans, including the Chief, going through a Stargate, but that thing happened where they get sent forward in time and it turns out that the Flood and the Wraith joined forces and was destroying everything all over the place. It was neato when the 3 Spartans were going through this colossal tunnel just mowing aliens down.
There was also a dream I had that was Minecraft mixed with all sorts of crazy stuff. I remember a bunch of people, including myself, in a small enclosed room, a loudspeaker telling us to run, and a wall opening into a Minecraft world. Some people joined together and went off on their own, but mostly, everyone just scattered. I remember making a little cave house thing, somewhere near a crashed helicopter or something, when it was night time and some random chick started asking for my help. I did and I shared the cave thing with her, and I was just looking out when I see Gandalf surrounded be these huge, heavily armored dudes that looked like the Authority from RAGE with assault rifles just coming down a path. Apparently, these guys were on my side and they drove off these demons things and were gathering people who were set loose and were willing to come with them, or something.