Tree of life:

The tree of life is a powerful, life-affirming symbol in almost every culture. With its branches reaching towards the sky, and roots embedded deeply in the earth, it dwells in three worlds, becoming a link between heaven, the earth, and the underworld, uniting above and below. It represents all that is true, wholesome, stable, and noble. When you are in need of stability and strength in your life - envision the tree of life in your minds eye.

Lotus:

Buddhists liken the unfolding of the lotus petals to the unfolding of the divine within the human self. The closed bloom represents the heart with its infinite potential for enlightenment; the open blossom represents the enlightened self.

In Buddhism the lotus blossom represents a heart opening. The lotus flower blooms on the surface of water, with its roots deep below in mud - making it a symbol of light and beauty emerging from darkness.

Greenman:

The Greenman is commonly interpreted as a symbol of rebirth, or "renaissance," representing the cycle of growth each spring.