colour themed nursery

I'm planning a black/white/grey room for now. Will add some pops of colour when we know the gender. Anyone else just doing colours, not animals or cartoon or things like that? I'm totally not going to do that, but am trying to think of a few more things to add to decorate. It's not going to have a ton of space, so I need to be picky. Will basically have a single bed (cuz a guest room), crib and dresser for now. Ideas for walls? Where to find bedding for both?