Painting 'holy' fire? How?

Hi all,

I'm trying to paint some minis for an RPG and in my head I want to make the fire on some of them visually distinct from regular fire, as "holy fire" from a divine source rather than the normal mundane run of the mill warm stuff (for plot reasons) but I'm not sure if its convincingly possible and for it to still be immediately recognisable as fire. I've found examples of flames in other colours but mostly greens and pinks in line with common warhammer themes.

Has anyone else ever tried such an effect? The only solution I could think of was to stick to desaturated colder yellows rather than the typical warm yellows and oranges, but googling around turned up nothing relevant so I'm at a bit of a loss and havent found any references.