Dota 2 hero effect mods
Ability effects on their own, for when the model is fine and the particles are not.
The D2PFX catalog has 7 mods in this category. Each changes what you see on your own screen; everyone else sees their own game.
Ancient Apparition Shatterblast
Keeper of the Light Northlight Illuminance
Lifestealer Golden Effects
Tinker Peashooter Turrets
Huskar White Screen Effect
Enigma World Chasm Artifact
Sniper Ardalan Interdictor
Installing any of these
Open Dota 2 Mod Manager, find the hero, press Install. The app puts the file in a free pak slot in the folder your game mounts, tells you when two mods carry the same file, and puts everything back after a Dota patch. The full guide, or the manual route if you would rather do it yourself.