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!
DIY: How to paint perfect wall stripes
Striped wall in entryway | 11 Magnolia Lane. Paint colors: Benjamin Moore revere pewter(darker) & edgecomb grey(lighter). Next to each other on the paint chip.
Light grey walls w/ flat finish accented by a metallic silver and flat dark grey striped wall.
Teen Girl’s Room - gray striped walls, black and white bedding...
Gray Chevron Baby Bedding from New Arrivals! Inspired by the popular zig zag pattern, our Gray Chevron Baby Bedding will give your nursery a modern, clean look.
Grey stripe wallpaper. Lille by Laura Ashley. Bedroom (k.wood)
Love the idea of grey walls with a grey/white striped accent wall...then could throw in an accent color once we find out the sex