Trelawney I could see working as the fortune telling at a Carnivale, Snape hmmm...cook is boring, rock star maybe? lol. Lucius I could see as someone like Donald Trump. Ron - Walmart cashier lol sorry.
I can see Hermione as a librarian. One of those ones that tells you more information than you asked for. Like if you asked for a book on greek mythology, she'd go into detail about every myth ever told related to greek mythology. Just so you know that she knows it, and because she maybe actually wants to help you. :)
Actually, now that I think about it, she'd be a better teacher. Use the reasons I said above and apply them to her being a teacher. *nods*
Harry...well he's so great at everything, I'm having a hard time choosing something. >> I actually have no idea for Harry. I almost said Aurors but then reminded myself that there aren't any of them in muggle society, and I can't really see him as a policeman. Maybe the CIA or FBI...ooo, sounds cool.
Those are really good jobs for the both of them. I can definitely see Ron joining the army and Molly crying her eyes out as he left. Ron would be a good soldier, I'm sure. :) Harry would be good in the Peace Corps too, although he might attract too much trouble for them to be able to handle. XD
Draco would be a waiter dressed up in a cute little waiter's uniform. I can just SEE him doing it, even if he hated it...like, being forced to work in his father's restaurant, or something.
Dumbledore...I think he'd be a pediatrician. I'm not sure -why- I think that, but I do.
Arthur would be an electician! or an inventor! Dumbledore would be vice-president of England, he won't be President, just because he would rather work behind the scenes!