Since we have flames of the Sky and Earth, why not add Ocean?
I swear I had the same thought last year. The exact same thought on Ocean flames.
The only problem I remembered was that Rain is Dark Blue, and Glacier Flame is Light Blue.
So the Ocean Flames might be limited in terms of colouring but we could give this a try.
Orange-Sky, Red-Storm, Blue-Rain, Indigo-Mist, Yellow-Sun, Green-Lightning, Purple-Cloud, Very Dark Orange-Earth, Light Blue-Glacier,
Desert, Swamp(Most pathetic name for flame), Mountain and Forest not yet confirmed.
Ocean flames will have a hard time picking flame colours lol.