Hey, Twilight is one of my favorite movies.
I get some wallpapers just for iPad and iPhone 4. The wallpapers are in the right size. You can download them here:
http://pptgarden.blogspot.com/2011/11/free-download-twilight-saga-breaking.html
There are still some wallpapers for pc.
http://powerpointfan.blogspot.com/2011/11/free-download-twilight-saga-breaking.html