Eeee, this idea makes me gleeful. Hooray for hobbits. ^^ (And I will totally have to do this on my birthday, too.)

As for request, possibly Discworld sounds wonderful, though something Good Omens is perfectly acceptable too and if you really don't want to write either of those, then I certainly won't say no to some Remus/Sirius. ^^ But please don't do all three, because there are already an inordinate amount of people requesting things, and I don't want to bog you down.

...And, of course, happy birthday! And thanks again. ^^