I want a wicked calgary flames one... the closest i've seen to a cool flames one is this:
FREE!
It makes a crackling sound (option to disable) and you can pair it with an mp3 of your choice too! (option to disable)
Screenshot
More Options:
Fantastic Flame
It's free to try, which includes an unlimited trial of the basic yellow/orange flames, but if you want the crazy colours you have to drop $20.
All are totally clean, as are all items on download.com.