Whilst I have not tried this out myself (because I haven't had a decent lucid in a while) I remember reading something about magic spells - if a particular phrase has a strong connection within your mind to something, you can use that to your advantage. For example, if you're big on Harry Potter, you could speak in the dream "wingardium leviosa" and do the motion with your magic wand in order to levitate objects.
The one I want to try is from Skyrim (I love that god damn game) - shouting "Fus-Ro-Dah" whilst motioning my hand toward the desired area of effect should produce the sweet effect of blowing everything in front of me away.
So yeah, if you know any fire spells from films that have a strong connection in your mind then try that!

Also, I really like RebelSeven's idol idea!