How would you decorate?

So our only option for sleeping arrangements is having the baby in my boyfriend and I’s room. The room has 2 closets so one will be ours and one will be for the baby’s stuff and next to the closet is a little nook with a few shelves which I plan to put some baby stuff on. There is one wall where we plan to put the crib and changing table which is by the closet and shelves. I really love the idea of a feature wall with wallpaper in nurseries but I don’t know how I feel about putting it in our room because I don’t want it to look completely like a nursery when it’s also our bedroom. I was thinking about putting wallpaper with a design or something on the wall where the crib and changer is and leaving the other 3 walls just a solid color. Would you do this if it was your room or would you just leave it all one color?