Puzzler: Movie-poster mashups (the sequel) answers:

Movie: 300 (2006)
Game: Lemmings

Movie: Titanic (1997)
Games: Ninja Gaiden 2 (Ryu and Irene), Final Fantasy (ship)

Movie: 2001: A Space Odyssey (1968)
Game: Darkstalkers 3 (Fetus of God)

Movie: Moon (2009)
Game: Rad Gravity

Movie: Rosemary's Baby (1968)
Game: Dissidia Final Fantasy (Terra Branford)

Movie: Hard Candy (2005)
Game: Darkstalkers 3 (B.B. Hood)

Movie: Cloverfield (2008)
Games: T.M.N.T. 4: Turtles in Time (statue), Fighter's History (city), Metal Slug (smoke and fire)

Movie: Akira (1988)
Game: Chrono Trigger

For more movie-poster mashups, check out Jay Henningsen's original puzzler here.