Personally I wouldn't do black/white unless I know for sure they like that. I like the combination, but it wouldn't work in my bedroom or any room in my house for that matter. I would definitely try and get some color ideas. You can start up a conversation about the house and it's progress. Casually ask about color schemes - mention kitchen, bathroom, living room also so that you're not focusing on just the bedroom.I'm sure they will love anything you make, but if you want them to be able to incorporate it into the decor, I think you need to get some info. But, that's just my opinion!