Carvings were some of humans earliest art forms. Mostly the subjects were concrete figures like humans or animals. Carvings were done on bones, horns, weapons, and occasionally even tools. They would always have a purpose too. Like Cave Paintings, a carving might be used to show respect for animals as they were convinced to die more readily for the hunters.
They had many other purposes though. A man might carry a knife with a tiger or some other powerful animal on it to call upon its powers of virility. A child might be given a rattle with the symbol of a snake so that he or she might live a long life. A young woman might be given a needle with the symbol of the Great Goddess to curry favor with fertility and conceive a child. For prehistoric humans, carvings were rarely done just so a tool looked better.