Check out how this mobile coordinates with the walls!
Project Nursery - Pink and Gold Nursery with Metallic Stripes on Accent Wall
Painting stripes on a wall is easier than you think, and makes a huge impact! This tutorial simplifies the process.
I love the thought of gray for the basic tone, and then just add pink/blue accents or gender neutral shades for accents if you want it to be a surprise!
Project Nursery - Colorful Striped Wall in Latina Nursery
Ten Tips on Painting a Striped Wall Read more - http://www.stylemepretty.com/living/2013/08/26/ten-tips-on-painting-a-striped-wall/
Project Nursery - Gray and Pink Striped Wall Glider