Alien versus Predator
15 mm scale
I never thought that tagline made sense - Predators supposedly kill a few armed people at a time, whereas Xenomorphs kill everyone indiscriminately. Not really equivalent.
Figures are "Vacation Alien" and "Space Demon" from Khurasan Miniatures. I don't see the Hunters on the site any more, I wonder if someone's lawyer gave him a call? (ed. - they're under "cinematic aliens", along with the classic B-movie Martians)
For basing, I'm going to sculpt some of that chitinous crap that Xenomorphs secrete all over their nesting areas in the movies, and maybe some techy floor remnants to fill out the base area for an infested colony effect.