Take a look at some examples of work that use a complementary color scheme.
This color scheme could use any two colors that lie directly across the color wheel from one another.
  For example, red and green or red-orange and blue-violet.
The strong contrast in this color scheme really grabs the viewer's attention.
 It creates a feeling of excitement and anticipation.


                                            Birthday   Marc Chagall




                                                                                Southwest Airlines Spirit 1 ad


The red and green and oranges and blues of these two examples are very exciting.
This color scheme is definitely NOT harmonious.
Placing the complementaries directly next to one another has the strongest impact.