Visualization for Muladhara (Root Chakra) and grounding.
Imagine yourself deep in the woods, sitting on the ground. The only sound you hear is the creaking of branches around you as the wind blows. Gradually become aware of a warmth seeping into your body from the ground below you. Currents of energy are pulsing through the roots of the trees around you. A living network.
Feel the red energy of Muladhara, your Root Chakra, begin to swirl and pulse in response. Tiny rivers of red light flow out from your root chakra and down into the Earth. The trees and the Earth itself respond, streaming their brilliant energy into your root chakra from all around you and connecting you to the sea of energy.
Stay with this image as long as you like.