hell lets throw them both into the underworld franchise and see what kind of mess we could make. now that would be one twisted movie. I am just kidding but imagine a werewolf alien or predator or even a vampire predator. Or lets add them into a zombie flick.... LOL.
or Aliens vs Freddy: Like to see what happens when his little bladed glove melts away from alien blood. lol
I would like to see Aliens Vs Predator in a Jurasic setting.
I am Legend except that there are no wild animals and the bad guys are Aliens. Maybe its a little spin off of the novel Aliens: Earth Hive but damn it would still make a good flick.
Of course I think the ultimate Alien Vs Pedator movie would be to show the home world of the Aliens for a change, a bunch of Colonial Marines trying to capture a Queen for that damn bio weapon, and in the midst of it all a ship full of Predators shows up to try to capture a Queen for them selves to try to set up a new training colony. but rated hard R and lots of blood and guts and no mushy back story. and at least two hours long.