There's a mask from PARMA called Aggrivation. this features tribal type flames and they are outlined. The only issue with these precut masks is they take infinite patience to get right
Funny I did the same idea on my nsx take a look. I used the parma aggrivation mask, metallic blue, and true blue pearl, and window tint all from pactra. Take a look and tell me if this is anythign like you're thinking.
I didn't use the outline I sniped it off from the mask but it's a perfect outline.