Sculpting Fire

I picked up a few new models recently.  They're Warmachine models from Privateer Press, and this particular batch is a bunch of giant robots built by religious zealots who like fire, along with some holy knights with flaming swords.  For that reason, I decided to try my hand at sculpting some flames:

The green bits are the parts I added, made from a two-part epoxy putty usually called "green stuff."  The flamethrower on the last fellow doesn't look quite right, but I'm pleased with the other two.  Hopefully I'll get around to painting them soon.