You can use the color sample cards from paint companies. Just walk to the paint isle in local hardware store, paint store, Home Depot and such, and pick some of the sample cards, including some whites, grays, reds, greens, yellows, oranges, and blues. Experiment with them, and write down notes on the back of the cards for future use. You will be amazed, how you can create special effects, color corrections, compensations, etc.using those cards. Follow your camera user manual to create closeups of the cards for future use. Use custome white balance option in the camera. You can create different light effects, e.g. a moon lit landscape in broad daylight, or sunrises/sunsets with pleasing colors, or snow scapes with beautiful blues or purples. Just remember, the color you will see in the photograph as a result will be complementary to the color of the card you used. For example, if you used blue card, the result will have a colorcast of orange of the same intensity, if you used red card, you will have a green colorcast in the photo, if you used a purple card, you will have a yellow color cast, or vice versa, and so on.