Phineas Crow said:If you want a more realistic modern representation of the elements I would go with:
Space (replaces air)
Time (replaces water)
Matter (replaces earth)
Energy (replaces fire)
This isn't the D&D Immortals set =)
White Wolf did a pretty good take on modern elementals in their book Axis Mundi for Mage/Werewolf. I'd suggest skimming that--if I can find my copy I'll post them later.