I rather like what appears to be the theme: two eccentric young men somehow get the run of a stately home for the weekend and do whatever the hell they want. The photographic style, as though someone has a fairly old, rickety camera, adds to that mood too. I have to say that I tend to prefer the ones with Tom in, but that's because I am a self-confessed Tom-Felton-lover. Besides Rupert needs to look a bit silly in some of his, since I'm positive he's going to be a great comic actor.
Pictures nabbed from here, visit it if you want to see all of them.