After about 50 tries:
Fire + snow or mountain or ice or storm
Cold + firefly or scorch or lava or. One or blazing
Hybrid with fire + hybrid with cold
Sad to say i stil was not able to successfully breed a blue fire dragon. After this pending mountain dragon, i'm gonna move on and try breeding for a sandstorm dragon. I'll just buy the bluefire with redgems. Anyway i only need around 20 more gems to buy that elusive bluefire. Hopefully i'll be able to breed for a sandstorm and a rainbow dragon.