a very pleasant mediation you can try involves the same visualization used for grounding. imagine above you is a cloud of white/blue energy (if you're in a room...if outside, a light shinging on your crown works too). below you, your feet have grown rots that dig deep into the earth, as far as you can imagine. as you inhale, you draw in energy from above, that moves down your front, and draw energy from below that moves up your back. on the exhale, you release the earth energy through your crown, and the crown energy to the earth.
rememebr though, as with any meditation, a visualization is a visualization is a visualization. energy follows thought, and can take any form you imagine. use whatever visualization works best for you. if the root anology is difficult, imaginet that your feet are on top of wells, or perhaps pillars of light.
dave