A white Rubik's cube? Square snow flakes? Some sort of stress ball? Not quite. The answer is a spoilerishly interesting theory for the upcoming movie Super 8.
Of course with spoilers being spoilers, if you want to watch Super 8 with a clean slate you should probably click away now. I know I would have.
Anyway! The theory floating around is that these white Rubik's cube are actually the E.T./monster/alien life form in the movie. Latino Review has pieced together evidence from trailers and viral videos that suggest the mysterious creature in Super 8 isn't the classic living, breathing beast or the doe eyed cutesy we come in piece types. It might actually be some sort of object (think Flubber without the Flub).