I want to see a Dragon who has no scales, but instead has slits all along its body. When agitated it starts emitting gas out of the slits and lights on fire when the dragon breathes flame. The angrier the dragon gets, the stronger the gas jets get, until they form flat, diamond shaped blue jets that form scales. think Oxy-acetaline torch in the shape of diamonds.
When ambushing, the dragon just gasses the place and then ignites it for a massive fireball. if the dragon flies and doesnt ignite itself but somehow the gas catches fire, it leaves a flaming pheonix-esq trail behidn the dragon.
Man i wish i could mod things.