Hi there,
Currently shots fired by Will of Fate are aether green. I think that comes from a copy paste of Vortex of Souls effect? 
In my humble opinion it should be blue-ish elemental, like the shots fired by Kymon.
The pale blue of Elemental Seal would be best, IMO. But yes, would be great.
Personally, I’m still hoping that all attacks will be dynamically colored to match whatever the highest damage type is. So if you take, say, Chaos Cadence, and have mostly Phys damage, it looks usual… And then Abomination pops, and suddenly it’d be Chaos colored to match the biggest damage type.