You can just use a round tip and taper it up. Or you could cut them out of fondant. I have a flame cake in my gallery where I did that and then I made center pieces for each flame that I covered in super sparkly disco dust. It's hard to see the sparkle in the picbut it had a really cool effect!
The one time I made flames I used a leaf tip with yellow and red icing in the bag at the same time. I just pulled straight up. They came out great, unfortunatley, I dont' have a pic of that cake...
I used a large star tip and put red, yellow and orange BC in the bag all at the same time so it would give the flames that glow.
Last night I made a volcano cake with lava coming out of the top. I used red piping gel and then put golden yellow colored piping gel on top of the red gel. It looked like really hot lava! Since it was piping gel with no specific shape needed, I just cut off the tip of a parchment bag (about size 5 or 7 tip opening).
The one time I made flames I used a leaf tip with yellow and red icing in the bag at the same time. I just pulled straight up. They came out great, unfortunatley, I dont' have a pic of that cake...
That's the way I've done it also
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