here's a sample of a style decor you can use to create a baby nook in a closet. i choose orla kiely wallpaper to make a feature wall. this will make a very bold statement and wow factor to your precious tiny space for your little star. A simple basic cot will do and just add some cute handmade soft toy or pillow , a wall birdcage decor and a lamp. But you need to get rid of the closet door for ventilation and if possible use a humidifier.