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 6 mods in this category. Each changes what you see on your own screen; everyone else sees their own game.
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Keeper of the Light Northlight Illuminance
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Lifestealer Golden Effects
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Tinker Peashooter Turrets
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Huskar White Screen Effect
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Enigma World Chasm Artifact
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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.