it is usually made during diwali (deepawali), wedding, onam, pongal and other indian festivals. . colour is made of sawdust. these colors are eco friendly.rangoli is a native of indian culture and is used in every festive occasion to decorate one's house. these colors spread positive vibrations within the environment and make to lively and entertaining.it also signify a warm welcome for visitors. many traditionalists also believe that drawing of rangolis on the floor near the main doorway of the house warded off evil spirits.