I can see how that would work, giving it more of a darker backdrop/more contrast for the flames.

That's my exact setup as well, but with the Gloom Wings. 

I use it with gloom armor and celstial hood with the 12 challenge blue glowing eyes, I like how it looks.

i use arctic armor mtx. i had all the parts except for chest and saw no need for it until i got harbinger pack.

As something is so very blue, what visuals (MTX or not) have you found that go well with it? I was thinking maybe the Arctic Armor MTXs for a kind of frostfire look, or maybe the Arcane Lightning Armor set now that it's freely available (the blue matches up better with the Harbinger fire) but am unwilling to try without seeing it first. WTB preview MTX on current character ability before purchasing.

[Discussion] Harbinger Character Effect, what goes well with it?