A triadic colour scheme is used in this illustration, the colours blue, purple and orange that are evenly spaced around the colour wheel. Triadic colour harmonies tend to be quite vibrant, even if you use pale or unsaturated versions of your hues.
Credit: Honors Communication Design Class at Spalding HS. This design is simply yet powerful. The fading letters create an emphasis on the first two letters in each word, but you still see the message they are trying to send which it "don't quit".