Now that the dragons have 'elemental' elements attached to them, why not add notable/ visible particle effects to each of their buffs?
(Forgive me code writers........)
Earth Dragon: add a boulder breaking particle after attacks on tower/ epic monsters.
Ocean Dragon: add a swirling Nami flow-like particle when the healing is up.
Wind Dragon: this one needs buffs.... make the current particle effect much more visible.
Fire Dragon: this one needs moving around a bit. Move the increased stat into additional percentage damage on attacks, adjusting for circumstance, and add a burning particle effect on the additional damage.
Another thing I would like to suggest is that the elemental dragon buffs may be too passive to be interesting.
Why not, for instance:
Ocean Dragon: give significant regeneration buffes while in river that wears out when outside the river. Also add in turning on/off particles when someone enters the river/time passes afterwards.
Earth Dragon: give significant armor/MR buffes while in jungle. Mutatis mutandis for Ocean Dragon
Wind Dragon: seems fine as it is,
Fire Dragon: Seems fine as it is.
It'd be also nice if there are interactions with champions for the dragons.
I.E. give easter-egg level buff for Brand with a Fire Dragon, Malphite with Earth etc.