
How about some nice outgassing effects.
[gas]
simulateBase = "sim_smoke"
lifeTime = 3.5
renderBase = "draw_twirl"
textureName = "cloud.dxtbz2"
textureBlend = "dstcolor one modulate" // draws cloud in the colors behind it.
startColor = "200 255 200 255" //but a bit greenish.
finishColor = "0 0 0 0"
startRadius = 0.1
finishRadius = 3.0
animateTime = 3.5
rotationRate = 5.0