Like Colors
Colors are either “warm” or “cool”. Colors that are similar in temperature (warm or cool) always produce harmonious color combinations. If you paired blue and green in a room or warm beige with brown in a hallway, they would work well together and be pleasing to your guests.
Monochrome Works
Monochrome is displaying a single color or different shades of a single color.
Complimentary Colors
In a color wheel, complimentary colors are across from one another; red and green, yellow and purple, and blue and orange. Paired together, they POP and create energy.