One of the most interesting powersets I played was along the lines of an 'earth elemental type'.
He had your basic earth control, earth shields, flying rock blasts, etc. However, he also had X-Ray vision-only through natural rock/earth. He also had free movement through rock/earth (with both of these abilities, he could essentially 'fight' from underground). Ride on earth waves, mini-earthquakes. He also had an 'Earth-sense', he could tell where things were and information about them, if they were touching the earth within a certain radius.