Sage green is a color with a lot of sweetness, but that isn't the only thing it has going for it. It's also a fashionable and contemporary color.
Ruffled Bedding cover
Other relaxing tones, such as muted blues and earthy browns, complement sage green beautifully. Try mixing sage with a brighter shade for a more daring effect.
The bedding should compliment, but not necessarily match, the wall hue. In fact, the bedding color should probably not be identical to the wall color. If you're not careful, this could overwhelm the room and flood it with too much of the same color.