What color wall would go good with this Camo Bedding for my two Toddlers? Picture attached..?

I say solid color curtains, you don't want too many patterns or it will look cluttered. Once you get the bedding, color match one room green and one room a tan with a yellow tint to it. That way they can have the same bedding but each room will have it's own distinct style. The easiest thing to do it take one of the pillowcases with you to Home Depot or Lowes and they can color match the paint to it. There are so many colors in that bedding the possibilties are endless. Just be sure the color you pick is light, since the bedding is dark.