What are the Ganesha idols made of?

The initial idols were made of mud but over time, Plaster of Paris (POP) became quite common. However, the latter pollutes the rivers and clogs water sources and contains harmful levels of mercury and cadmium. With growing awareness, a lot of people are now opting for Eco-friendly idols made of easily dissoluble soil, coconut husk, fish friendly foods, and plant seeds.