Have a color in mind? Pair it with different types of construction to see the effect. The luster and softness of the fiber affects the look of the color. Get a luxurious, suede look with really soft fibers, or a more dimensional color and casual look with longer, textured yarns.
Texture is THE big story in carpet and home furnishings these days. Add visual interest with loop or pattern. Pick a carpet that complements your favorite piece of furniture and go from there to make a personal design statement.