Right now, ours is browns, tans, and greens- earthy tones, but I'm switching things up very soon and am going with grey and orange with some hot pink accents on DD's side. I searched for bedding sets that would coordinate and became frustrated with the lack of options. Most boy stuff was dark or bold, while the girl stuff was muted or pastels. There's always the option of staying with white or off white walls, but I grew up un a house with no color so I've made it a point to have a more colorful home of my own!
Loving life with our very energetic 2 year old b/g twins!