This is probably a bit early in dev to be looking at particle effects for spells. but here I am anyway.
One of the things I really liked in the beginning of eq1 that was later changed and I have never really seen mentioned was that the particle effects for spell started small and got larger and/or more colorful as you got higher level.
as an example if a druid cast lesser heal. it has a rather small effect if however a level 20 cast that same spell it had a much larger particle effect
where skin like wood had a small simple green effect. after level 20 it was much larger more sparkles and also had orange particles added to it.
as you got stronger / higher level the same spells looked more powerful and I don't mean that lesser heal had a smaller effect than greater heal I mean the exact same spell got more powerful looking. it was just one more display of progression and if someone buffed you in passing I would be like " wow that must be a high character, I cant wait for my spells to look like that." I really enjoyed this and would love to see it return in a game like Pantheon... just one of many little details lost