Water is another, and thunder is a third. Water relates to the ability to flow through life and let it cover you with healing. Thunder is indicated by power images and darker stones. It represents power, and certain areas of power or helplessness in a life. Wind, lakes, peace, mountains and fire are all other areas of energy.
Wind celebrates newer blessings in a life, and prosperity.
Peace is the reconciliation of opposing forces, lakes bring creative powers to the mind, and mountains represent our own spirituality and the journey to get to an inner peace. Finally, fire is the light of illumination, burning even as it enlightens. It symbolizes inner happiness and contentment when present in the right amount. Some of the elements should be studiously avoided in certain areas. For instance, water should never be placed in a bedroom because of it's transient quality.