It's official, Killzone 2 will be providing unlockable bonus content that would include papercrafts. Just read a post from the PlayStation blogs posted by Victor Zuylen (Killzone Community Editor), here's the best part:
If you’re good enough, you can even unlock and download physical objects from the Killzone universe. “That’s impossible,” I hear you cry at your monitor, “You can’t to download physical objects through the Internet – let alone objects from a fictional universe.” Ah, but then you’ve obviously never witnessed the venerable art of papercraft
That sweet paper model on the pic is the Intruder - a type of drop ship that's going to appear in the game. You can read the complete article here:
Also found this video on GameVideos.com showing how the Intruder came to be, check it out if you're interested.
Star Trek Papercraft
Command and Conquer Papercraft
Cowboy Bebop Papercraft