The complementary color scheme is used above in this picture of the butterflies and the flowers
An analogous color scheme is seen above using reds, red-oranges, and oranges
This piece of blue wonderful-ness uses a monochromatic color scheme!
Split-complementary was used in this photograph, in a way: Orange and blue-violet/blue-green, or the other way around: Blue and yellow-orange/red-orange
Split-complementary: This piece uses yellows, reds, and blues to create a slightly geometric look, as they do not simply "blend together".