An exercise using a Triadic Color scheme is a good way to familiarize yourself with the color wheel. A triadic scheme is any three colors equally spaced on the color wheel. Trying a variety of triadic schemes for the same subject gives you a feel for each color and how it relates with colors as well as forcing you to see your subject in different colors and temperatures. An example from the color wheel would be "red, blue, yellow", another would be "green, orange, violet". The first image shown here is a "green, orange, violet" scheme, the second is "blue-violet, yellow-green, red-orange" scheme. Posted at http://www.betweenthepalettescrapings.com.