All of them are impressive in my terms on the basis of providing example spells to go off of for further homebrew. Example:
Molten Missile
Sor/Wiz 1, Clr 2*, Drd 1
as Lava Missile, except for the following:
- +1 caster level when cast within 1 mile of an active volcano's base.
- Material Components: Fist-sized chunk of pumice and a chip of obsidian.
- Clerics with the Fire domain may cast this as a 1st level spell if they are within 5 miles of an active volcano's base.