You could alter the origin of the material on the X, Y and Z planes, which may result in it wrapping around the back, or out of view without changing the overall material much. Or, you could experiment with different mapping strategies, such as "faces", "spherical", etc. There's alot you could do to change this, but I would personally recommend studying the material and creating your own, based on it's bumps, color production, and color maps, as well as mixture percentages and altitude dependance, and World/Object Space.