THIS exists in M-E?

[William Cloud Hicklin]

It's concievable (though would be almost completely anathemic) that gandalf supplemented his fireworks with his own power or the power of his ring (which i believe was known as the "ring of fire") Although someone as wise as gandalf probably wouldn't have used a ring of power so frivlously, it is possible that, after the fall of the necromancer he felt safe using this power, untill the rumours of the dark lord rose again.

I'm not sure it's a question of Gandalf "using" or "wielding" the power of Narya, so much as the fact that his long possession enhanced his understanding of fire, which enabled him to manipulate it. I really doubt he was casually using his Ring in Bag-end during the Unexpected Party, with his trained smoke-rings!