So that it's not the same shade as Kopaka's half-transparent mask we're getting with Skull Warrior?
Like with the protectors ammo, keeping elements assigned to colors, in a sense.
So, while gali may have light blue on her, Water as an element is defined by the darker blue
If this is a correct assumption, then
Fire: Trans Neon Orange
Water: Trans Dark Blue
Earth: Purple/Trans Purple
Stone: Trans Neon Green
Jungle: Trans Bright Green
Ice: Trans Light Blue