Do not under estimate the power of art. Whether it is a back splashed wall, wall appliques, a painted mural or just framed art - incorporate some sort of art into the nursery. Not only will this help liven up a room but it will be a nice focal point for you to admire as you rock your sweet babe to sleep each night.
You can even involve siblings by asking them to draw or paint a picture for their new brother or sister. The piece would serve as a great art display and be a memory the sibling can cherish for a lifetime.