Painting bands of colour really adds pattern, just like a wallpaper. It can make a space feel finished, even without a lot of furnishings.
This room is a perfect unisex nursery, neutral and yet fun.
(click on image to make it larger)
For this look try the following Benjamin Moore colours (from top to bottom):
HC-80 Bleecker Beige, HC-69 Whitall Brown, 2059-70 Fountain Spout, 2059-40 Yosemite Blue