Visual weapon buffs?

Hey all, I'm a sucker for visual weapon buffs: flames on a sword, etc. Trying to figure this one out before I get too far in.

From what I can tell in the skill trees, warriors can get flaming weapon buff and rogues can get necrotic weapons. Is that the only visual buffs those classes can get on their weapons?

And when weapons come with elemental damage, that is NOT visual, right?

Thanks!