An easy to do classic effect that is very visual.

Effect: The magician shows the audience five silks. One is red, one is yellow, one is green, one is blue and one is white. The white silk is tied around the others. The white silk is untied, and set aside. The other four silks are then held between the magician’s hands. He twirls his hands for a moment. Suddenly, instead of four individual silks, he only has one big 36" square silk scarf in his hands! that is composed of the four colors: red, yellow, green, and blue.  The four silks have blended into one.