I was bored so I made a sketch. Please excuse the crappy penciling.
Wing frame and halo have cold white flames emitted from them, sort of like candle light. This is how priests light their reagents pre-4.0 -cough-.
The actual wings are white auras...they are not very visible, sort of like shaman tier 10 or warlock tier 6 shoulders, every once in a while they glow white very brightly, but fades after.
This might look funky on male models T__T"
I'd imagine the colour scheme to be golden wing frames/head piece/belt, white robe with black accent, orbs default as scarlet but differ based on normal/heroic version.
Obvious inspiration is Mr. Tyrael, I'm not very original sorry.