The Orphanage (2007) rips off The Others (2001).
I love both films but other than ghosts, they're totally
Anyway, I want to say Daybreakers has lots of ideas from Richard Matheson's I Am Legend. However, as none of the I Am Legend films do the book justice, I'm more than happy with Daybreakers taking the ideas and actually doing something intresting with them.
Solo rips off Robocop and Terminator.