Im pretty sure i heard somewhere in lore Turalyon was so powerful with the light that his powers turned blue/white from his attunement with the light itself.
Id love a paladin questline that would help do just that, the yellow holy effects look very dull after a while, but they look awesome in other colors. The only color that affected spells that i know of is the hallows end orange pumpkin tint effect from trick or treating, and the added tint of orange made the light look awesome for a paladin.
Problem would be to explain it in lore, im not sure that link i read is even up anymore.