Definition : A scheme with colors that don't on fall on the color wheel; black white, gray for example.

Explanation : Room 1 - This is an example if a neutral color scheme because the colors that the room is done is are neutral colors (tans and browns as well as whites)
Room 2 - This is an example of a neutral color scheme because the colors used to decorate the room are neutral (black and white)

Neutral Scheme