The larger the sample, the easier it will be for you to make a decision. Solid colors and light colors tend to make space appear larger, while patterned and dark colors usually make space appear smaller. Don't let those facts hinder you in doing something you really want to do, however. Soiling shows more readily on white or light yellow carpeting. Medium colors, color blends and patterns are best for disguising signs of use between cleanings.
Darker colors tend to show lint and accumulated dust more readily than light or medium colors.
Selecting a color value the same as the usual soil in your locality helps keep carpet looking soil-free longer. Color is psychologically important. It can affect not only the apparent size of a space, but the temperature and mood of a room. The use of warm or cool colors depends on personal preferences, climate and the orientation of your home. Blues and greens often are preferred in rooms having natural light and southern exposure.