XDA user Rawat has extracted a couple of the live wallpapers from the Samsung Galaxy S II and provided the APKs for your viewing pleasure.
A big thanks to XDA member Clipp from SmartKeitai who provided the following video:
There are two APK files with the secret live wallpapers.
Secret Wallpaper 1 is the beach scene: [ Download ]
Secret Wallpaper 2 is the windmill scene: [ Download ]